On 10/27/21 8:22 AM, Harry Wentland wrote:
On 2021-10-27 10:39, Guenter Roeck wrote:
On Wed, Oct 13, 2021 at 04:04:13PM -0400, Thelford Williams wrote:
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.
Signed-off-by: Thelford Williams tdwilliamsiv@gmail.com Signed-off-by: Alex Deucher alexander.deucher@amd.com
The fix works, but unless I am missing something it is incomplete. parse_write_buffer_into_params() is called several times, and the size parameter is always wrong. This patch only fixes one of several instances of the problem.
Patrik sent a patch that covers all cases: https://patchwork.freedesktop.org/patch/461554/?series=96341&rev=2
Harry
Thanks!
Guenter
Guenter
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 814f67d86a3c..9b3ad56607bb 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 @@ -264,7 +264,7 @@ 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, ¶m_nums)) {
-- 2.33.0