linux-kernel - Re: [syzbot] [dri?] KASAN: slab-use-after-free Read in drm_atomic_helper_wait_for

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Date: Wed, 14 Feb 2024 11:39:37 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+0f999d26a4fd79c3a23b@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [dri?] KASAN: slab-use-after-free Read in drm_atomic_helper_wait_for_vblanks (2)

On Tue, 13 Feb 2024 06:08:15 -0800
> HEAD commit:    c664e16bb1ba Merge tag 'docs-6.8-fixes2' of git://git.lwn...
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11fcdba2180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master

--- x/drivers/gpu/drm/drm_client_modeset.c
+++ y/drivers/gpu/drm/drm_client_modeset.c
@@ -1062,6 +1062,8 @@ out_ctx:
 	return ret;
 
 backoff:
+	if (state->commit_work.func)
+		cancel_work_sync(&state->commit_work);
 	drm_atomic_state_clear(state);
 	drm_modeset_backoff(&ctx);
 
--