From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
dri-devel@lists.freedesktop.org, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.0 220/262] drm/vkms: Fix flush_work() without INIT_WORK().
Date: Wed, 27 Mar 2019 14:01:15 -0400 [thread overview]
Message-ID: <20190327180158.10245-220-sashal@kernel.org> (raw)
In-Reply-To: <20190327180158.10245-1-sashal@kernel.org>
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
[ Upstream commit b30b61ff6b1dc37f276cf56a8328b80086a3ffca ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/vkms/vkms_crtc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index a0bef7de9df7..1054f535178a 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -95,6 +95,7 @@ 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;
--
2.19.1
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next prev parent reply other threads:[~2019-03-27 18:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190327180158.10245-1-sashal@kernel.org>
2019-03-27 17:58 ` [PATCH AUTOSEL 5.0 078/262] drm/amd/display: Fix reference counting for struct dc_sink Sasha Levin
2019-03-27 17:59 ` [PATCH AUTOSEL 5.0 114/262] drm/amd/display: Clear stream->mode_changed after commit Sasha Levin
2019-03-27 17:59 ` [PATCH AUTOSEL 5.0 135/262] drm/sched: Fix entities with 0 rqs Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 147/262] drm: allow render capable master with DRM_AUTH ioctls Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 168/262] fbdev: fbmem: fix memory access if logo is bigger than the screen Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 170/262] drm: rcar-du: add missing of_node_put Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 188/262] drm/vkms: Bugfix racing hrtimer vblank handle Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 189/262] drm/vkms: Bugfix extra vblank frame Sasha Levin
[not found] ` <20190327180158.10245-1-sashal-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-03-27 17:58 ` [PATCH AUTOSEL 5.0 070/262] drm/amd/display: Pass app_tf by value rather than by reference Sasha Levin
2019-03-28 10:04 ` Pavel Machek
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 171/262] drm/amd/display: Don't re-program planes for DPMS changes Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 175/262] drm/amd/display: Disconnect mpcc when changing tg Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 194/262] drm/msm/dpu: Convert to a chained irq chip Sasha Levin
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 242/262] drm/nouveau: Stop using drm_crtc_force_disable Sasha Levin
2019-03-27 18:00 ` [PATCH AUTOSEL 5.0 204/262] backlight: pwm_bl: Use gpiod_get_value_cansleep() to get initial state Sasha Levin
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 207/262] drm/amd/display: Enable vblank interrupt during CRC capture Sasha Levin
2019-03-27 18:01 ` Sasha Levin [this message]
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 241/262] drm: Auto-set allow_fb_modifiers when given modifiers at plane init Sasha Levin
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 248/262] drm/fb-helper: fix leaks in error path of drm_fb_helper_fbdev_setup Sasha Levin
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 256/262] drm: Reorder set_property_atomic to avoid returning with an active ww_ctx Sasha Levin
2019-03-27 18:01 ` [PATCH AUTOSEL 5.0 257/262] drm/dp/mst: Configure no_stop_bit correctly for remote i2c xfers Sasha Levin
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