Fwd: [PATCH] Size can be any value and is user controlled resulting in overwriting the 40 byte array wr_buf with an arbitrary length of data from buf.

[T. Williams]

---------- Forwarded message ---------
From: docfate111 <tdwilliamsiv at gmail.com>
Date: Mon, Oct 11, 2021 at 4:22 PM
Subject: [PATCH] Size can be any value and is user controlled resulting in
overwriting the 40 byte array wr_buf with an arbitrary length of data from
buf.
To: <dri-devel at lists.freedesktop.org>
Cc: <harry.wentland at amd.com>, <sunpeng.li at amd.com>


Signed-off-by: docfate111 <tdwilliamsiv at gmail.com>
---
 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 87daa78a32b8..17f2756a64dc 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
@@ -263,7 +263,7 @@ static ssize_t dp_link_settings_write(struct file *f,
const char __user *buf,
        if (!wr_buf)
                return -ENOSPC;

-       if (parse_write_buffer_into_params(wr_buf, size,
+       if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           (long *)param, buf,
                                           max_param_num,
                                           &param_nums)) {
-- 
2.25.1



-- 
Thank you for your time,
Thelford Williams
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