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drm/msm: Fix potential buffer overflow issue 

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>
This commit is contained in:
Kasin Li 2017-06-19 15:36:53 -06:00 committed by Rob Clark
parent 51c9fbe694
commit 4a630fadbb
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/msm/msm_gem_submit.c
View File

@ -31,11 +31,14 @@
#define BO_PINNED 0x2000
static struct msm_gem_submit *submit_create(struct drm_device *dev,
struct msm_gpu *gpu, int nr_bos, int nr_cmds)
struct msm_gpu *gpu, uint32_t nr_bos, uint32_t nr_cmds)
{
struct msm_gem_submit *submit;
int sz = sizeof(*submit) + (nr_bos * sizeof(submit->bos[0])) +
(nr_cmds * sizeof(*submit->cmd));
uint64_t sz = sizeof(*submit) + (nr_bos * sizeof(submit->bos[0])) +
(nr_cmds * sizeof(submit->cmd[0]));
if (sz > SIZE_MAX)
return NULL;
submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
if (!submit)