* [PATCH] usb: Use memdup_user to reuse the code
@ 2015-12-08 11:38 Pathak, Rahul (R.)
2015-12-08 11:51 ` Dan Carpenter
0 siblings, 1 reply; 2+ messages in thread
From: Pathak, Rahul (R.) @ 2015-12-08 11:38 UTC (permalink / raw)
To: gregkh, stern, kborer, dan.carpenter, chasemetzger15
Cc: linux-usb, linux-kernel
From: Rahul Pathak <rpathak@visteon.com>
Fixing coccicheck warning which recommends to use memdup_user instead
to reimplement its code, using memdup_user simplifies the code
./drivers/usb/core/devio.c:1398:11-18: WARNING opportunity for memdup_user
Signed-off-by: Rahul Pathak <rpathak@visteon.com>
---
drivers/usb/core/devio.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 38ae877c..05266f0 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1395,11 +1395,9 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
number_of_packets = uurb->number_of_packets;
isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
number_of_packets;
- isopkt = kmalloc(isofrmlen, GFP_KERNEL);
- if (!isopkt)
- return -ENOMEM;
- if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
- ret = -EFAULT;
+ isopkt = memdup_user(iso_frame_desc, isofrmlen);
+ if (IS_ERR(isopkt)) {
+ ret = PTR_ERR(isopkt);
goto error;
}
for (totlen = u = 0; u < number_of_packets; u++) {
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] usb: Use memdup_user to reuse the code
2015-12-08 11:38 [PATCH] usb: Use memdup_user to reuse the code Pathak, Rahul (R.)
@ 2015-12-08 11:51 ` Dan Carpenter
0 siblings, 0 replies; 2+ messages in thread
From: Dan Carpenter @ 2015-12-08 11:51 UTC (permalink / raw)
To: Pathak, Rahul (R.)
Cc: gregkh, stern, kborer, chasemetzger15, linux-usb, linux-kernel
On Tue, Dec 08, 2015 at 11:38:59AM +0000, Pathak, Rahul (R.) wrote:
> diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
> index 38ae877c..05266f0 100644
> --- a/drivers/usb/core/devio.c
> +++ b/drivers/usb/core/devio.c
> @@ -1395,11 +1395,9 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
> number_of_packets = uurb->number_of_packets;
> isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
> number_of_packets;
> - isopkt = kmalloc(isofrmlen, GFP_KERNEL);
> - if (!isopkt)
> - return -ENOMEM;
> - if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
> - ret = -EFAULT;
> + isopkt = memdup_user(iso_frame_desc, isofrmlen);
> + if (IS_ERR(isopkt)) {
> + ret = PTR_ERR(isopkt);
> goto error;
This introduces a one err bug.
https://plus.google.com/106378716002406849458/posts/dnanfhQ4mHQ
We can't call kfree(isopkt) when it is an ERR_PTR.
Set it to NULL:
isopkt = memdup_user(iso_frame_desc, isofrmlen);
if (IS_ERR(isopkt)) {
ret = PTR_ERR(isopkt);
isopkt = NULL;
goto error;
}
regards,
dan carpenter
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-12-08 11:51 ` Dan Carpenter
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