Patch "drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-fix-a-potential-buffer-overflow-in-d.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 880ffec73eddc65c0f32e7f86bc4745d3cccb965
Author: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
Date:   Tue Jan 23 20:18:07 2024 +0530

    drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'
    
    [ 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@xxxxxxx>
    Cc: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
    Cc: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
    Cc: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
    Cc: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
    Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

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 6d694cea24201..ed2f6802b0e20 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
@@ -1304,7 +1304,7 @@ 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);