4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>
[ Upstream commit b5c5baa458faa5430c445acd9a17481274d77ccf ]
It may be possible, albeit unlikely, to encounter integer overflow
during the multiplication of several unsigned int variables, the
result being assigned to a variable 'size' of wider type.
Prevent this potential behaviour by converting one of the multiples
to unsigned long.
Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.
Fixes: 0242f74d29df ("drm/radeon: clean up CS functions in r100.c")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/r100.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index b24401f21e93..15241b80e9d2 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -2307,7 +2307,7 @@ int r100_cs_track_check(struct radeon_device *rdev, struct r100_cs_track *track)
switch (prim_walk) {
case 1:
for (i = 0; i < track->num_arrays; i++) {
- size = track->arrays[i].esize * track->max_indx * 4;
+ size = track->arrays[i].esize * track->max_indx * 4UL;
if (track->arrays[i].robj == NULL) {
DRM_ERROR("(PW %u) Vertex array %u no buffer "
"bound\n", prim_walk, i);
@@ -2326,7 +2326,7 @@ int r100_cs_track_check(struct radeon_device *rdev, struct r100_cs_track *track)
break;
case 2:
for (i = 0; i < track->num_arrays; i++) {
- size = track->arrays[i].esize * (nverts - 1) * 4;
+ size = track->arrays[i].esize * (nverts - 1) * 4UL;
if (track->arrays[i].robj == NULL) {
DRM_ERROR("(PW %u) Vertex array %u no buffer "
"bound\n", prim_walk, i);
--
2.43.0
