linux-kernel - [PATCH] drm/radeon: fix uninitialized size issue in radeon_vce_cs

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Message-ID: <20250311111501.9190-1-n.zhandarovich@fintech.ru>
Date: Tue, 11 Mar 2025 14:14:59 +0300
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: Alex Deucher <alexander.deucher@....com>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	Christian König <christian.koenig@....com>, Xinhui Pan
	<Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>, <amd-gfx@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH] drm/radeon: fix uninitialized size issue in radeon_vce_cs_parse()

On the off chance that command stream passed from userspace via
ioctl() call to radeon_vce_cs_parse() is weirdly crafted and
first command to execute is to encode (case 0x03000001), the function
in question will attempt to call radeon_vce_cs_reloc() with size
argument that has not been properly initialized. Specifically, 'size'
will point to 'tmp' variable before the latter had a chance to be
assigned any value.

Play it safe and init 'tmp' with 0, thus ensuring that
radeon_vce_cs_reloc() will catch an early error in cases like these.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 2fc5703abda2 ("drm/radeon: check VCE relocation buffer range v3")
Cc: stable@...r.kernel.org
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
---
 drivers/gpu/drm/radeon/radeon_vce.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_vce.c b/drivers/gpu/drm/radeon/radeon_vce.c
index d1871af967d4..2355a78e1b69 100644
--- a/drivers/gpu/drm/radeon/radeon_vce.c
+++ b/drivers/gpu/drm/radeon/radeon_vce.c
@@ -557,7 +557,7 @@ int radeon_vce_cs_parse(struct radeon_cs_parser *p)
 {
 	int session_idx = -1;
 	bool destroyed = false, created = false, allocated = false;
-	uint32_t tmp, handle = 0;
+	uint32_t tmp = 0, handle = 0;
 	uint32_t *size = &tmp;
 	int i, r = 0;