From: Igor Artemiev Igor.A.Artemiev@mcst.ru
[ Upstream commit a1e2da6a5072f8abe5b0feaa91a5bcd9dc544a04 ]
It is possible, although unlikely, that an integer overflow will occur when the result of radeon_get_ib_value() is shifted to the left.
Avoid it by casting one of the operands to larger data type (u64).
Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.
Signed-off-by: Igor Artemiev Igor.A.Artemiev@mcst.ru Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/radeon/r600_cs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c index 1e6ad9daff534..c738740f8b19e 100644 --- a/drivers/gpu/drm/radeon/r600_cs.c +++ b/drivers/gpu/drm/radeon/r600_cs.c @@ -2102,7 +2102,7 @@ static int r600_packet3_check(struct radeon_cs_parser *p, return -EINVAL; }
- offset = radeon_get_ib_value(p, idx+1) << 8; + offset = (u64)radeon_get_ib_value(p, idx+1) << 8; if (offset != track->vgt_strmout_bo_offset[idx_value]) { DRM_ERROR("bad STRMOUT_BASE_UPDATE, bo offset does not match: 0x%llx, 0x%x\n", offset, track->vgt_strmout_bo_offset[idx_value]);