korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-14 15:54:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

drm/dp_mst: Check if primary mstb is null

Browse Source 
commit 23d8003907 upstream.

Unfortunately drm_dp_get_mst_branch_device which is called from both
drm_dp_mst_handle_down_rep and drm_dp_mst_handle_up_rep seem to rely
on that mgr->mst_primary is not NULL, which seem to be wrong as it can be
cleared with simultaneous mode set, if probing fails or in other case.
mgr->lock mutex doesn't protect against that as it might just get
assigned to NULL right before, not simultaneously.

There are currently bugs 107738, 108616 bugs which crash in
drm_dp_get_mst_branch_device, caused by this issue.

v2: Refactored the code, as it was nicely noticed.
    Fixed Bugzilla bug numbers(second was 108616, but not 108816)
    and added links.

[changed title and added stable cc]
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108616
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107738
Link: https://patchwork.freedesktop.org/patch/msgid/20181109090012.24438-1-stanislav.lisovskiy@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislav Lisovskiy 2018-11-09 11:00:12 +02:00 committed by Greg Kroah-Hartman
parent 438f22af06
commit b1fd8f5996
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -1232,6 +1232,9 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_
mutex_lock(&mgr->lock); mutex_lock(&mgr->lock);
mstb = mgr->mst_primary; mstb = mgr->mst_primary;
if (!mstb)
goto out;
for (i = 0; i < lct - 1; i++) { for (i = 0; i < lct - 1; i++) {
int shift = (i % 2) ? 0 : 4; int shift = (i % 2) ? 0 : 4;
int port_num = (rad[i / 2] >> shift) & 0xf; int port_num = (rad[i / 2] >> shift) & 0xf;