On 11 November 2016 at 10:56, Liviu Dudau <liviu.dudau@xxxxxxx> wrote:
> Hi Shailendra,
>
> On Fri, Nov 11, 2016 at 02:16:08PM +0530, Shailendra Verma wrote:
>> From: "Shailendra Verma" <shailendra.v@xxxxxxxxxxx>
>>
>> There is possible dereference of NULL pointer if kmalloc fails.
>
> You could add: ... when the function returns. From the patch itself it is
> not clear where the problem is.
>
As the function returns we have "return &state->base;" Since base is
at offset 0 there will be no deref and the compiler will return NULL.
Not sure if that's 100% legal, though.
>> ---
>> drivers/gpu/drm/arm/malidp_planes.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
>> index 82c193e..f769398 100644
>> --- a/drivers/gpu/drm/arm/malidp_planes.c
>> +++ b/drivers/gpu/drm/arm/malidp_planes.c
>> @@ -54,6 +54,9 @@ struct drm_plane_state *malidp_duplicate_plane_state(struct drm_plane *plane)
>> return NULL;
>>
>> state = kmalloc(sizeof(*state), GFP_KERNEL);
>> + if (!state)
>> + return NULL;
>> +
>> if (state) {
Might want to drop this line - as-is things read quite weird ?
Either way, not my driver - so don't read too much into the above ;-)
Emil
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