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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2019-01-19 01:43:43 +0900
committerDaniel Vetter <daniel.vetter@ffwll.ch>2019-01-24 10:47:38 +0100
commitb30b61ff6b1dc37f276cf56a8328b80086a3ffca (patch)
tree33c38dcd818c10beb4aaefea56ed13e21536a09d
parent46f3ceaffa81e846677bca8668e0ad40e643cffd (diff)
drm/vkms: Fix flush_work() without INIT_WORK().
syzbot is hitting a lockdep warning [1] because flush_work() is called without INIT_WORK() after kzalloc() at vkms_atomic_crtc_reset(). Commit 6c234fe37c57627a ("drm/vkms: Implement CRC debugfs API") added INIT_WORK() to only vkms_atomic_crtc_duplicate_state() side. Assuming that lifecycle of crc_work is appropriately managed, fix this problem by adding INIT_WORK() to vkms_atomic_crtc_reset() side. [1] https://syzkaller.appspot.com/bug?id=a5954455fcfa51c29ca2ab55b203076337e1c770 Reported-and-tested-by: syzbot <syzbot+12f1b031b6da017e34f8@syzkaller.appspotmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reviewed-by: Shayenne Moura <shayenneluzmoura@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1547829823-9877-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
-rw-r--r--drivers/gpu/drm/vkms/vkms_crtc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 177bbcb38306..3c37d8c41d4a 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -104,6 +104,7 @@ static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
if (!vkms_state)
return;
+ INIT_WORK(&vkms_state->crc_work, vkms_crc_work_handle);
crtc->state = &vkms_state->base;
crtc->state->crtc = crtc;