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drm/msm: Fix potential buffer overflow issue

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commit 4a630fadbb upstream.

In function submit_create, if nr_cmds or nr_bos is assigned with
negative value, the allocated buffer may be small than intended.
Using this buffer will lead to buffer overflow issue.

Signed-off-by: Kasin Li <donglil@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kasin Li
2017-06-19 15:36:53 -06:00
committed by Greg Kroah-Hartman
parent 6e6eba5ba1
commit 031b02bc16
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/msm/msm_gem_submit.c
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@@ -34,10 +34,13 @@ static inline void __user *to_user_ptr(u64 address)
}
static struct msm_gem_submit *submit_create(struct drm_device *dev,
struct msm_gpu *gpu, int nr)
struct msm_gpu *gpu, uint32_t nr)
{
struct msm_gem_submit *submit;
int sz = sizeof(*submit) + (nr * sizeof(submit->bos[0]));
uint64_t sz = sizeof(*submit) + (nr * sizeof(submit->bos[0]));
if (sz > SIZE_MAX)
return NULL;
submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
if (submit) {