linux-kernel - [PATCH v4.19-v6.1] drm/amdgpu: Using uninitialized value *size when calling

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Message-ID: <20240828151607.448360-2-vamsi-krishna.brahmajosyula@broadcom.com>
Date: Wed, 28 Aug 2024 10:15:56 -0500
From: Vamsi Krishna Brahmajosyula <vamsi-krishna.brahmajosyula@...adcom.com>
To: stable@...r.kernel.org,
	gregkh@...uxfoundation.org
Cc: jesse.zhang@....com,
	alexander.deucher@....com,
	sashal@...nel.org,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	ajay.kaher@...adcom.com,
	alexey.makhalov@...adcom.com,
	vasavi.sirnapalli@...adcom.com,
	Vamsi Krishna Brahmajosyula <vamsi-krishna.brahmajosyula@...adcom.com>
Subject: [PATCH v4.19-v6.1] drm/amdgpu: Using uninitialized value *size when calling

From: Jesse Zhang <jesse.zhang@....com>

[ Upstream commit 88a9a467c548d0b3c7761b4fd54a68e70f9c0944 ]

Initialize the size before calling amdgpu_vce_cs_reloc, such as case 0x03000001.
V2: To really improve the handling we would actually
   need to have a separate value of 0xffffffff.(Christian)

Signed-off-by: Jesse Zhang <jesse.zhang@....com>
Suggested-by: Christian König <christian.koenig@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Vamsi Krishna Brahmajosyula <vamsi-krishna.brahmajosyula@...adcom.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
index ecaa2d748..0a28daa14 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
@@ -725,7 +725,8 @@ int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p, uint32_t ib_idx)
 	uint32_t created = 0;
 	uint32_t allocated = 0;
 	uint32_t tmp, handle = 0;
-	uint32_t *size = &tmp;
+	uint32_t dummy = 0xffffffff;
+	uint32_t *size = &dummy;
 	unsigned idx;
 	int i, r = 0;
 
-- 
2.39.4