linux-kernel - [PATCH AUTOSEL 4.14 1/9] drm/radeon: Fix integer overflow in radeon_cs_parser

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Message-Id: <20230724012450.2320077-1-sashal@kernel.org>
Date:   Sun, 23 Jul 2023 21:24:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     hackyzh002 <hackyzh002@...il.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, airlied@...ux.ie,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.14 1/9] drm/radeon: Fix integer overflow in radeon_cs_parser_init

From: hackyzh002 <hackyzh002@...il.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@....com>
Signed-off-by: hackyzh002 <hackyzh002@...il.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.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