Patch "drm/msm: Fix potential buffer overflow issue" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

drm/msm: Fix potential buffer overflow issue

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-msm-fix-potential-buffer-overflow-issue.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Kasin Li <[email protected]>
Date: Mon, 19 Jun 2017 15:36:53 -0600
Subject: drm/msm: Fix potential buffer overflow issue

From: Kasin Li <[email protected]>

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.

---
 drivers/gpu/drm/msm/msm_gem_submit.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -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)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-msm-fix-potential-buffer-overflow-issue.patch