drm/dp_mst: Fix NULL deref in drm_dp_get_one_sb_msg()

While we don't need this function to store an mstb anywhere for UP
requests since we process them asynchronously, we do need to make sure
that we don't try to write to **mstb for UP requests otherwise we'll
cause a NULL pointer deref:

    RIP: 0010:drm_dp_get_one_sb_msg+0x4b/0x460 [drm_kms_helper]
    Call Trace:
     ? vprintk_emit+0x16a/0x230
     ? drm_dp_mst_hpd_irq+0x133/0x1010 [drm_kms_helper]
     drm_dp_mst_hpd_irq+0x133/0x1010 [drm_kms_helper]
     ? __drm_dbg+0x87/0x90 [drm]
     ? intel_dp_hpd_pulse+0x24b/0x400 [i915]
     intel_dp_hpd_pulse+0x24b/0x400 [i915]
     i915_digport_work_func+0xd6/0x160 [i915]
     process_one_work+0x1a9/0x370
     worker_thread+0x4d/0x3a0
     kthread+0xf9/0x130
     ? process_one_work+0x370/0x370
     ? kthread_park+0x90/0x90
     ret_from_fork+0x35/0x40

So, fix this.

Signed-off-by: Lyude Paul <[email protected]>
Fixes: fbc821c4a506 ("drm/mst: Support simultaneous down replies")
Cc: Wayne Lin <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Wayne Lin <[email protected]>
Cc: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Sean Paul <[email protected]>

0 files changed, 0 insertions, 0 deletions