Nicolai Hähnle 60e3f5a916 drm/ttm: fix use-after-free races in vm fault handling ...

commit 3089c1df10 upstream.

The vm fault handler relies on the fact that the VMA owns a reference
to the BO. However, once mmap_sem is released, other tasks are free to
destroy the VMA, which can lead to the BO being freed. Fix two code
paths where that can happen, both related to vm fault retries.

Found via a lock debugging warning which flagged &bo->wu_mutex as
locked while being destroyed.

Fixes: cbe12e74ee ("drm/ttm: Allow vm fault retries")
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-05-14 13:32:59 +02:00

..

drm

drm/ttm: fix use-after-free races in vm fault handling

2017-05-14 13:32:59 +02:00

host1x

gpu: host1x: Fix MLOCK's debug info

2015-10-02 14:40:12 +02:00

ipu-v3

drm/imx: Match imx-ipuv3-crtc components using device node in platform data

2016-06-07 18:14:37 -07:00

vga

vgaarb: fix signal handling in vga_get()

2015-12-11 14:04:44 +10:00

Makefile

gpu: host1x: Provide a proper struct bus_type

2015-01-27 10:09:14 +01:00