[PATCH AUTOSEL 4.14 1/9] drm/radeon: Fix integer overflow in radeon_cs_parser_init

[PATCH AUTOSEL 4.14 1/9] drm/radeon: Fix integer overflow in radeon_cs_parser_init

[Sasha Levin]

From: hackyzh002 <hackyzh002@gmail.com>

[ 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>
---
 drivers/gpu/drm/radeon/radeon_cs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 1ae31dbc61c64..5e61abb3dce5c 100644
--- 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;
 
-- 
2.39.2

Re: [PATCH AUTOSEL 4.14 1/9] drm/radeon: Fix integer overflow in radeon_cs_parser_init

[Pavel Machek]

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Hi!

> From: hackyzh002 <hackyzh002@gmail.com>
> 
> [ 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

I only got the first patch of the series via lkml, rest seems to have
been lost somewhere :-(.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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