drm/radeon: Fix integer overflow in radeon_cs_parser_init

[ Upstream commit f828b681d0cd566f86351c0b913e6cb6ed8c7b9c ]

The type of size is unsigned, if size is 0x40000000, there will be an
integer overflow, size will be zero after size *= sizeof(uint32_t),
will cause uninitialized memory to be referenced later

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: hackyzh002 <hackyzh002@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 1ae31dbc61c64a2fbf30ede3a84fa0ea315fe8b5..5e61abb3dce5c8b9bec6eaac9f248a68557c5b0c 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -265,7 +265,8 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
 {
        struct drm_radeon_cs *cs = data;
        uint64_t *chunk_array_ptr;
-       unsigned size, i;
+       u64 size;
+       unsigned i;
        u32 ring = RADEON_CS_RING_GFX;
        s32 priority = 0;