drm/msm: fix an integer overflow test

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@oracle.com>
Acked-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 34edb4a4ccd49dabfdc4011138ad01a00827c762..f4eaccb191d4c986967f944d6ee2191ebf96bcb0 100644 (file)
--- 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_create(struct drm_device *dev,
                struct msm_gpu *gpu, uint32_t 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;