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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>,
	Alex Hung <alex.hung@amd.com>,
	Qingqing Zhuo <qingqing.zhuo@amd.com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>,
	Aurabindo Pillai <aurabindo.pillai@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>,
	Harry Wentland <harry.wentland@amd.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.6 369/638] drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'
Date: Sun, 24 Mar 2024 18:56:46 -0400
Message-ID: <20240324230116.1348576-370-sashal@kernel.org>
In-Reply-To: <20240324230116.1348576-1-sashal@kernel.org>
References: <20240324230116.1348576-1-sashal@kernel.org>
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From: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>

[ Upstream commit 4b09715f1504f1b6e8dff0e9643630610bc05141 ]

Tell snprintf() to store at most 10 bytes in the output buffer
instead of 30.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_debugfs.c:1508 dp_dsc_clock_en_read() error: snprintf() is printing too much 30 vs 10

Fixes: c06e09b76639 ("drm/amd/display: Add DSC parameters logging to debugfs")
Cc: Alex Hung <alex.hung@amd.com>
Cc: Qingqing Zhuo <qingqing.zhuo@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 7c21e21bcc51a..f4b9d43c5d979 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1453,7 +1453,7 @@ static ssize_t dp_dsc_clock_en_read(struct file *f, char __user *buf,
 	const uint32_t rd_buf_size = 10;
 	struct pipe_ctx *pipe_ctx;
 	ssize_t result = 0;
-	int i, r, str_len = 30;
+	int i, r, str_len = 10;
 
 	rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
 
-- 
2.43.0