* [PATCH] usb: storage: add error handling for kcalloc
@ 2018-06-11 8:52 ` Zhouyang Jia
0 siblings, 0 replies; 14+ messages in thread
From: Zhouyang Jia @ 2018-06-11 8:52 UTC (permalink / raw)
Cc: Zhouyang Jia, Alan Stern, Greg Kroah-Hartman, linux-usb,
usb-storage, linux-kernel
When kcalloc fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling kcalloc.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
drivers/usb/storage/alauda.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..c56355c 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,11 @@ static int alauda_init_media(struct us_data *us)
+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
+ if ((MEDIA_INFO(us).pba_to_lba == NULL)
+ || (MEDIA_INFO(us).lba_to_pba == NULL)) {
+ pr_warn("alauda_init_media: memory allocation failed\n");
+ return USB_STOR_TRANSPORT_ERROR;
+ }
if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
--
2.7.4
^ permalink raw reply related [flat|nested] 14+ messages in thread
* usb: storage: add error handling for kcalloc
@ 2018-06-11 8:52 ` Zhouyang Jia
0 siblings, 0 replies; 14+ messages in thread
From: Zhouyang Jia @ 2018-06-11 8:52 UTC (permalink / raw)
Cc: Zhouyang Jia, Alan Stern, Greg Kroah-Hartman, linux-usb,
usb-storage, linux-kernel
When kcalloc fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling kcalloc.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
drivers/usb/storage/alauda.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..c56355c 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,11 @@ static int alauda_init_media(struct us_data *us)
+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
+ if ((MEDIA_INFO(us).pba_to_lba == NULL)
+ || (MEDIA_INFO(us).lba_to_pba == NULL)) {
+ pr_warn("alauda_init_media: memory allocation failed\n");
+ return USB_STOR_TRANSPORT_ERROR;
+ }
if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
^ permalink raw reply related [flat|nested] 14+ messages in thread
* Re: [PATCH] usb: storage: add error handling for kcalloc
@ 2018-06-12 14:31 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-12 14:31 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Greg Kroah-Hartman, linux-usb, usb-storage, linux-kernel
On Mon, 11 Jun 2018, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> ---
> drivers/usb/storage/alauda.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..c56355c 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,11 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL)) {
> + pr_warn("alauda_init_media: memory allocation failed\n");
> + return USB_STOR_TRANSPORT_ERROR;
> + }
pr_info() isn't a good routine to use here, because it doesn't print
the device or driver name.
In any case, a log message isn't necessary. kcalloc() will already
put a message in the log if either of the allocations fails.
Alan Stern
>
> if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
> return USB_STOR_TRANSPORT_ERROR;
>
^ permalink raw reply [flat|nested] 14+ messages in thread
* usb: storage: add error handling for kcalloc
@ 2018-06-12 14:31 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-12 14:31 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Greg Kroah-Hartman, linux-usb, usb-storage, linux-kernel
On Mon, 11 Jun 2018, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> ---
> drivers/usb/storage/alauda.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..c56355c 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,11 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL)) {
> + pr_warn("alauda_init_media: memory allocation failed\n");
> + return USB_STOR_TRANSPORT_ERROR;
> + }
pr_info() isn't a good routine to use here, because it doesn't print
the device or driver name.
In any case, a log message isn't necessary. kcalloc() will already
put a message in the log if either of the allocations fails.
Alan Stern
>
> if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
> return USB_STOR_TRANSPORT_ERROR;
>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v2] usb: storage: add error handling for kcalloc
@ 2018-06-14 13:29 ` Zhouyang Jia
0 siblings, 0 replies; 14+ messages in thread
From: Zhouyang Jia @ 2018-06-14 13:29 UTC (permalink / raw)
Cc: Zhouyang Jia, Alan Stern, Greg Kroah-Hartman, linux-usb,
usb-storage, linux-kernel
When kcalloc fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling kcalloc.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
v1->v2:
- Remove pr_warn statement.
---
drivers/usb/storage/alauda.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..4e17609 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
+ if ((MEDIA_INFO(us).pba_to_lba == NULL)
+ || (MEDIA_INFO(us).lba_to_pba == NULL))
+ return USB_STOR_TRANSPORT_ERROR;
if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
--
2.7.4
^ permalink raw reply related [flat|nested] 14+ messages in thread
* [v2] usb: storage: add error handling for kcalloc
@ 2018-06-14 13:29 ` Zhouyang Jia
0 siblings, 0 replies; 14+ messages in thread
From: Zhouyang Jia @ 2018-06-14 13:29 UTC (permalink / raw)
Cc: Zhouyang Jia, Alan Stern, Greg Kroah-Hartman, linux-usb,
usb-storage, linux-kernel
When kcalloc fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling kcalloc.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
v1->v2:
- Remove pr_warn statement.
---
drivers/usb/storage/alauda.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..4e17609 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
+ if ((MEDIA_INFO(us).pba_to_lba == NULL)
+ || (MEDIA_INFO(us).lba_to_pba == NULL))
+ return USB_STOR_TRANSPORT_ERROR;
if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
^ permalink raw reply related [flat|nested] 14+ messages in thread
* Re: [PATCH v2] usb: storage: add error handling for kcalloc
@ 2018-06-14 14:58 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-14 14:58 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Greg Kroah-Hartman, linux-usb, usb-storage, linux-kernel
On Thu, 14 Jun 2018, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> ---
> v1->v2:
> - Remove pr_warn statement.
> ---
> drivers/usb/storage/alauda.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..4e17609 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL))
> + return USB_STOR_TRANSPORT_ERROR;
>
> if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
> return USB_STOR_TRANSPORT_ERROR;
>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
^ permalink raw reply [flat|nested] 14+ messages in thread
* [v2] usb: storage: add error handling for kcalloc
@ 2018-06-14 14:58 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-14 14:58 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Greg Kroah-Hartman, linux-usb, usb-storage, linux-kernel
On Thu, 14 Jun 2018, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> ---
> v1->v2:
> - Remove pr_warn statement.
> ---
> drivers/usb/storage/alauda.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..4e17609 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL))
> + return USB_STOR_TRANSPORT_ERROR;
>
> if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
> return USB_STOR_TRANSPORT_ERROR;
>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v2] usb: storage: add error handling for kcalloc
@ 2018-06-25 12:33 ` Greg Kroah-Hartman
0 siblings, 0 replies; 14+ messages in thread
From: Greg Kroah-Hartman @ 2018-06-25 12:33 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Alan Stern, linux-usb, usb-storage, linux-kernel
On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> ---
> v1->v2:
> - Remove pr_warn statement.
> ---
> drivers/usb/storage/alauda.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..4e17609 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL))
> + return USB_STOR_TRANSPORT_ERROR;
You just leaked memory if only one of these succeeded :(
^ permalink raw reply [flat|nested] 14+ messages in thread
* [v2] usb: storage: add error handling for kcalloc
@ 2018-06-25 12:33 ` Greg Kroah-Hartman
0 siblings, 0 replies; 14+ messages in thread
From: Greg Kroah-Hartman @ 2018-06-25 12:33 UTC (permalink / raw)
To: Zhouyang Jia; +Cc: Alan Stern, linux-usb, usb-storage, linux-kernel
On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> When kcalloc fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling kcalloc.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> ---
> v1->v2:
> - Remove pr_warn statement.
> ---
> drivers/usb/storage/alauda.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 900591d..4e17609 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> + || (MEDIA_INFO(us).lba_to_pba == NULL))
> + return USB_STOR_TRANSPORT_ERROR;
You just leaked memory if only one of these succeeded :(
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the body of a message to majordomo@vger.kernel.org
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v2] usb: storage: add error handling for kcalloc
@ 2018-06-25 15:22 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-25 15:22 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: Zhouyang Jia, linux-usb, usb-storage, linux-kernel
On Mon, 25 Jun 2018, Greg Kroah-Hartman wrote:
> On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> > When kcalloc fails, the lack of error-handling code may
> > cause unexpected results.
> >
> > This patch adds error-handling code after calling kcalloc.
> >
> > Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> > Acked-by: Alan Stern <stern@rowland.harvard.edu>
> > ---
> > v1->v2:
> > - Remove pr_warn statement.
> > ---
> > drivers/usb/storage/alauda.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> > index 900591d..4e17609 100644
> > --- a/drivers/usb/storage/alauda.c
> > +++ b/drivers/usb/storage/alauda.c
> > @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> > + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> > MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> > + || (MEDIA_INFO(us).lba_to_pba == NULL))
> > + return USB_STOR_TRANSPORT_ERROR;
>
> You just leaked memory if only one of these succeeded :(
That's not really true. The memory gets deallocated later on in any
case, when alauda_info_destructor() calls alauda_free_maps() if not
before.
More troubling is the fact that this routine (i.e, alauda_init_media)
gets called from only one place, in alauda_check_media, and the caller
completely ignores the return value! Furthermore, the caller always
returns USB_STOR_TRANSPORT_FAILED.
So on the whole, I don't think this patch is going to make any
difference to the driver's operation.
Alan Stern
^ permalink raw reply [flat|nested] 14+ messages in thread
* [v2] usb: storage: add error handling for kcalloc
@ 2018-06-25 15:22 ` Alan Stern
0 siblings, 0 replies; 14+ messages in thread
From: Alan Stern @ 2018-06-25 15:22 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: Zhouyang Jia, linux-usb, usb-storage, linux-kernel
On Mon, 25 Jun 2018, Greg Kroah-Hartman wrote:
> On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> > When kcalloc fails, the lack of error-handling code may
> > cause unexpected results.
> >
> > This patch adds error-handling code after calling kcalloc.
> >
> > Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> > Acked-by: Alan Stern <stern@rowland.harvard.edu>
> > ---
> > v1->v2:
> > - Remove pr_warn statement.
> > ---
> > drivers/usb/storage/alauda.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> > index 900591d..4e17609 100644
> > --- a/drivers/usb/storage/alauda.c
> > +++ b/drivers/usb/storage/alauda.c
> > @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> > + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> > MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> > + || (MEDIA_INFO(us).lba_to_pba == NULL))
> > + return USB_STOR_TRANSPORT_ERROR;
>
> You just leaked memory if only one of these succeeded :(
That's not really true. The memory gets deallocated later on in any
case, when alauda_info_destructor() calls alauda_free_maps() if not
before.
More troubling is the fact that this routine (i.e, alauda_init_media)
gets called from only one place, in alauda_check_media, and the caller
completely ignores the return value! Furthermore, the caller always
returns USB_STOR_TRANSPORT_FAILED.
So on the whole, I don't think this patch is going to make any
difference to the driver's operation.
Alan Stern
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v2] usb: storage: add error handling for kcalloc
@ 2018-06-28 10:52 ` Greg Kroah-Hartman
0 siblings, 0 replies; 14+ messages in thread
From: Greg Kroah-Hartman @ 2018-06-28 10:52 UTC (permalink / raw)
To: Alan Stern; +Cc: Zhouyang Jia, linux-usb, usb-storage, linux-kernel
On Mon, Jun 25, 2018 at 11:22:34AM -0400, Alan Stern wrote:
> On Mon, 25 Jun 2018, Greg Kroah-Hartman wrote:
>
> > On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> > > When kcalloc fails, the lack of error-handling code may
> > > cause unexpected results.
> > >
> > > This patch adds error-handling code after calling kcalloc.
> > >
> > > Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> > > Acked-by: Alan Stern <stern@rowland.harvard.edu>
> > > ---
> > > v1->v2:
> > > - Remove pr_warn statement.
> > > ---
> > > drivers/usb/storage/alauda.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> > > index 900591d..4e17609 100644
> > > --- a/drivers/usb/storage/alauda.c
> > > +++ b/drivers/usb/storage/alauda.c
> > > @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> > > + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> > > MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > > MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > > + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> > > + || (MEDIA_INFO(us).lba_to_pba == NULL))
> > > + return USB_STOR_TRANSPORT_ERROR;
> >
> > You just leaked memory if only one of these succeeded :(
>
> That's not really true. The memory gets deallocated later on in any
> case, when alauda_info_destructor() calls alauda_free_maps() if not
> before.
>
> More troubling is the fact that this routine (i.e, alauda_init_media)
> gets called from only one place, in alauda_check_media, and the caller
> completely ignores the return value! Furthermore, the caller always
> returns USB_STOR_TRANSPORT_FAILED.
>
> So on the whole, I don't think this patch is going to make any
> difference to the driver's operation.
Ok, I'm just going to drop it then.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 14+ messages in thread
* [v2] usb: storage: add error handling for kcalloc
@ 2018-06-28 10:52 ` Greg Kroah-Hartman
0 siblings, 0 replies; 14+ messages in thread
From: Greg Kroah-Hartman @ 2018-06-28 10:52 UTC (permalink / raw)
To: Alan Stern; +Cc: Zhouyang Jia, linux-usb, usb-storage, linux-kernel
On Mon, Jun 25, 2018 at 11:22:34AM -0400, Alan Stern wrote:
> On Mon, 25 Jun 2018, Greg Kroah-Hartman wrote:
>
> > On Thu, Jun 14, 2018 at 09:29:11PM +0800, Zhouyang Jia wrote:
> > > When kcalloc fails, the lack of error-handling code may
> > > cause unexpected results.
> > >
> > > This patch adds error-handling code after calling kcalloc.
> > >
> > > Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
> > > Acked-by: Alan Stern <stern@rowland.harvard.edu>
> > > ---
> > > v1->v2:
> > > - Remove pr_warn statement.
> > > ---
> > > drivers/usb/storage/alauda.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> > > index 900591d..4e17609 100644
> > > --- a/drivers/usb/storage/alauda.c
> > > +++ b/drivers/usb/storage/alauda.c
> > > @@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
> > > + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
> > > MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > > MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> > > + if ((MEDIA_INFO(us).pba_to_lba == NULL)
> > > + || (MEDIA_INFO(us).lba_to_pba == NULL))
> > > + return USB_STOR_TRANSPORT_ERROR;
> >
> > You just leaked memory if only one of these succeeded :(
>
> That's not really true. The memory gets deallocated later on in any
> case, when alauda_info_destructor() calls alauda_free_maps() if not
> before.
>
> More troubling is the fact that this routine (i.e, alauda_init_media)
> gets called from only one place, in alauda_check_media, and the caller
> completely ignores the return value! Furthermore, the caller always
> returns USB_STOR_TRANSPORT_FAILED.
>
> So on the whole, I don't think this patch is going to make any
> difference to the driver's operation.
Ok, I'm just going to drop it then.
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2018-06-28 11:01 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-06-11 8:52 [PATCH] usb: storage: add error handling for kcalloc Zhouyang Jia
2018-06-11 8:52 ` Zhouyang Jia
2018-06-12 14:31 ` [PATCH] " Alan Stern
2018-06-12 14:31 ` Alan Stern
2018-06-14 13:29 ` [PATCH v2] " Zhouyang Jia
2018-06-14 13:29 ` [v2] " Zhouyang Jia
2018-06-14 14:58 ` [PATCH v2] " Alan Stern
2018-06-14 14:58 ` [v2] " Alan Stern
2018-06-25 12:33 ` [PATCH v2] " Greg Kroah-Hartman
2018-06-25 12:33 ` [v2] " Greg Kroah-Hartman
2018-06-25 15:22 ` [PATCH v2] " Alan Stern
2018-06-25 15:22 ` [v2] " Alan Stern
2018-06-28 10:52 ` [PATCH v2] " Greg Kroah-Hartman
2018-06-28 10:52 ` [v2] " Greg Kroah-Hartman
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