This is a note to let you know that I've just added the patch titled drm/msm: fix an integer overflow test to the 4.4-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-an-integer-overflow-test.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 65e93108891e571f177c202add9288eda9ac4100 Mon Sep 17 00:00:00 2001 From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Date: Fri, 30 Jun 2017 10:59:15 +0300 Subject: drm/msm: fix an integer overflow test From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> commit 65e93108891e571f177c202add9288eda9ac4100 upstream. We recently added an integer overflow check but it needs an additional tweak to work properly on 32 bit systems. The problem is that we're doing the right hand side of the assignment as type unsigned long so the max it will have an integer overflow instead of being larger than SIZE_MAX. That means the "sz > SIZE_MAX" condition is never true even on 32 bit systems. We need to first cast it to u64 and then do the math. Fixes: 4a630fadbb29 ("drm/msm: Fix potential buffer overflow issue") Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Acked-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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -37,7 +37,7 @@ static struct msm_gem_submit *submit_cre struct msm_gpu *gpu, uint32_t int nr) { struct msm_gem_submit *submit; - uint64_t sz = sizeof(*submit) + (nr * sizeof(submit->bos[0])); + uint64_t sz = sizeof(*submit) + ((u64)nr * sizeof(submit->bos[0])); if (sz > SIZE_MAX) return NULL; Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are queue-4.4/drm-msm-fix-an-integer-overflow-test.patch