3.16.50-rc1 review patch. If anyone has any objections, please let me know.
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From: Kasin Li <donglil@xxxxxxxxxxxxxx>
commit 4a630fadbb29d9efaedb525f1a8f7449ad107641 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@xxxxxxxxxxxxxx>
Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
[bwh: Backported to 3.16: submit_create() only supports a variable number of bos]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -34,10 +34,13 @@ static inline void __user *to_user_ptr(u
}
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) {