4.9-stable review patch. If anyone has any objections, please let me know. ------------------ 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> Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/msm/msm_gem_submit.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -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)