* [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy
@ 2021-03-03 9:58 Colin King
2021-03-03 16:02 ` Ray Chi
0 siblings, 1 reply; 4+ messages in thread
From: Colin King @ 2021-03-03 9:58 UTC (permalink / raw)
To: Felipe Balbi, Greg Kroah-Hartman, Ray Chi, linux-usb
Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
Currently the null check logic on dwc->usb_psy is inverted as it allows
calls to power_supply_put with a null dwc->usb_psy causing a null
pointer dereference. Fix this by removing the ! operator.
Addresses-Coverity: ("Dereference after null check")
Fixes: 59fa3def35de ("usb: dwc3: add a power supply for current control")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/usb/dwc3/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index d15f065849cd..94fdbe502ce9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1628,7 +1628,7 @@ static int dwc3_probe(struct platform_device *pdev)
assert_reset:
reset_control_assert(dwc->reset);
- if (!dwc->usb_psy)
+ if (dwc->usb_psy)
power_supply_put(dwc->usb_psy);
return ret;
@@ -1653,7 +1653,7 @@ static int dwc3_remove(struct platform_device *pdev)
dwc3_free_event_buffers(dwc);
dwc3_free_scratch_buffers(dwc);
- if (!dwc->usb_psy)
+ if (dwc->usb_psy)
power_supply_put(dwc->usb_psy);
return 0;
--
2.30.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy
2021-03-03 9:58 [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy Colin King
@ 2021-03-03 16:02 ` Ray Chi
2021-03-03 21:29 ` Heiko Thiery
0 siblings, 1 reply; 4+ messages in thread
From: Ray Chi @ 2021-03-03 16:02 UTC (permalink / raw)
To: Colin King
Cc: Felipe Balbi, Greg Kroah-Hartman, linux-usb, kernel-janitors,
linux-kernel
On Wed, Mar 3, 2021 at 6:00 PM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently the null check logic on dwc->usb_psy is inverted as it allows
> calls to power_supply_put with a null dwc->usb_psy causing a null
> pointer dereference. Fix this by removing the ! operator.
>
> Addresses-Coverity: ("Dereference after null check")
> Fixes: 59fa3def35de ("usb: dwc3: add a power supply for current control")
Acked-by: Ray Chi <raychi@google.com>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> drivers/usb/dwc3/core.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index d15f065849cd..94fdbe502ce9 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1628,7 +1628,7 @@ static int dwc3_probe(struct platform_device *pdev)
> assert_reset:
> reset_control_assert(dwc->reset);
>
> - if (!dwc->usb_psy)
> + if (dwc->usb_psy)
> power_supply_put(dwc->usb_psy);
>
> return ret;
> @@ -1653,7 +1653,7 @@ static int dwc3_remove(struct platform_device *pdev)
> dwc3_free_event_buffers(dwc);
> dwc3_free_scratch_buffers(dwc);
>
> - if (!dwc->usb_psy)
> + if (dwc->usb_psy)
> power_supply_put(dwc->usb_psy);
>
> return 0;
> --
> 2.30.0
>
Thanks for fixing this bug!
Regards,
Ray
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy
2021-03-03 16:02 ` Ray Chi
@ 2021-03-03 21:29 ` Heiko Thiery
2021-03-03 22:47 ` Colin Ian King
0 siblings, 1 reply; 4+ messages in thread
From: Heiko Thiery @ 2021-03-03 21:29 UTC (permalink / raw)
To: raychi
Cc: balbi, colin.king, gregkh, kernel-janitors, linux-kernel,
linux-usb, Heiko Thiery
Hi all,
> On Wed, Mar 3, 2021 at 6:00 PM Colin King <colin.king@canonical.com> wrote:
>>
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Currently the null check logic on dwc->usb_psy is inverted as it allows
>> calls to power_supply_put with a null dwc->usb_psy causing a null
>> pointer dereference. Fix this by removing the ! operator.
>>
>> Addresses-Coverity: ("Dereference after null check")
>> Fixes: 59fa3def35de ("usb: dwc3: add a power supply for current control")
>
> Acked-by: Ray Chi <raychi@google.com>
>
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Heiko Thiery <heiko.thiery@gmail.com>
>> ---
>> drivers/usb/dwc3/core.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index d15f065849cd..94fdbe502ce9 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1628,7 +1628,7 @@ static int dwc3_probe(struct platform_device *pdev)
>> assert_reset:
>> reset_control_assert(dwc->reset);
>>
>> - if (!dwc->usb_psy)
>> + if (dwc->usb_psy)
>> power_supply_put(dwc->usb_psy);
>>
>> return ret;
>> @@ -1653,7 +1653,7 @@ static int dwc3_remove(struct platform_device *pdev)
>> dwc3_free_event_buffers(dwc);
>> dwc3_free_scratch_buffers(dwc);
>>
>> - if (!dwc->usb_psy)
>> + if (dwc->usb_psy)
>> power_supply_put(dwc->usb_psy);
>>
>> return 0;
>> --
>> 2.30.0
>>
Thank you.
--
Heiko
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy
2021-03-03 21:29 ` Heiko Thiery
@ 2021-03-03 22:47 ` Colin Ian King
0 siblings, 0 replies; 4+ messages in thread
From: Colin Ian King @ 2021-03-03 22:47 UTC (permalink / raw)
To: Heiko Thiery, raychi
Cc: balbi, gregkh, kernel-janitors, linux-kernel, linux-usb
On 03/03/2021 21:29, Heiko Thiery wrote:
> Hi all,
>
>> On Wed, Mar 3, 2021 at 6:00 PM Colin King <colin.king@canonical.com> wrote:
>>>
>>> From: Colin Ian King <colin.king@canonical.com>
>>>
>>> Currently the null check logic on dwc->usb_psy is inverted as it allows
>>> calls to power_supply_put with a null dwc->usb_psy causing a null
>>> pointer dereference. Fix this by removing the ! operator.
>>>
>>> Addresses-Coverity: ("Dereference after null check")
>>> Fixes: 59fa3def35de ("usb: dwc3: add a power supply for current control")
>>
>> Acked-by: Ray Chi <raychi@google.com>
>>
>>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>
> Tested-by: Heiko Thiery <heiko.thiery@gmail.com>
Thanks for testing. Much appreciated.
Colin
>
>>> ---
>>> drivers/usb/dwc3/core.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>>> index d15f065849cd..94fdbe502ce9 100644
>>> --- a/drivers/usb/dwc3/core.c
>>> +++ b/drivers/usb/dwc3/core.c
>>> @@ -1628,7 +1628,7 @@ static int dwc3_probe(struct platform_device *pdev)
>>> assert_reset:
>>> reset_control_assert(dwc->reset);
>>>
>>> - if (!dwc->usb_psy)
>>> + if (dwc->usb_psy)
>>> power_supply_put(dwc->usb_psy);
>>>
>>> return ret;
>>> @@ -1653,7 +1653,7 @@ static int dwc3_remove(struct platform_device *pdev)
>>> dwc3_free_event_buffers(dwc);
>>> dwc3_free_scratch_buffers(dwc);
>>>
>>> - if (!dwc->usb_psy)
>>> + if (dwc->usb_psy)
>>> power_supply_put(dwc->usb_psy);
>>>
>>> return 0;
>>> --
>>> 2.30.0
>>>
>
> Thank you.
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-03-04 0:22 UTC | newest]
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2021-03-03 9:58 [PATCH] usb: dwc3: Fix dereferencing of null dwc->usb_psy Colin King
2021-03-03 16:02 ` Ray Chi
2021-03-03 21:29 ` Heiko Thiery
2021-03-03 22:47 ` Colin Ian King
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