linux-kernel - [PATCH 1/2] drm/radeon: Fix integer overflow in radeon_cs_parser

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Message-Id: <20230419042407.69001-1-hackyzh002@gmail.com>
Date:   Wed, 19 Apr 2023 12:24:07 +0800
From:   hackyzh002 <hackyzh002@...il.com>
To:     alexander.deucher@....com
Cc:     christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, sumit.semwal@...aro.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, hackyzh002 <hackyzh002@...il.com>
Subject: [PATCH 1/2] drm/radeon: Fix integer overflow in radeon_cs_parser_init

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

Signed-off-by: hackyzh002 <hackyzh002@...il.com>
---
 drivers/gpu/drm/radeon/radeon_cs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 46a27ebf4..472c29050 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -270,7 +270,7 @@ 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, i;
 	u32 ring = RADEON_CS_RING_GFX;
 	s32 priority = 0;
 
@@ -347,7 +347,7 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
 				continue;
 		}
 
-		p->chunks[i].kdata = kvmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
+		p->chunks[i].kdata = kvcalloc(size, sizeof(uint32_t), GFP_KERNEL);
 		size *= sizeof(uint32_t);
 		if (p->chunks[i].kdata == NULL) {
 			return -ENOMEM;
-- 
2.34.1