5.0-stable review patch. If anyone has any objections, please let me know.
------------------ From: Tetsuo Handa <[email protected]> commit b30b61ff6b1dc37f276cf56a8328b80086a3ffca upstream. 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 <[email protected]> Signed-off-by: Tetsuo Handa <[email protected]> Reviewed-by: Shayenne Moura <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/1547829823-9877-1-git-send-email-penguin-ker...@i-love.sakura.ne.jp Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/vkms/vkms_crtc.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/vkms/vkms_crtc.c +++ b/drivers/gpu/drm/vkms/vkms_crtc.c @@ -98,6 +98,7 @@ static void vkms_atomic_crtc_reset(struc 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;
