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

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Message-Id: <20241003005956.1869-1-hdanton@sina.com>
Date: Thu,  3 Oct 2024 08:59:56 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+9ba7a8cdae0440edd57b@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in binder_release_work

On Wed, 02 Oct 2024 14:10:22 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    ad46e8f95e93 Merge tag 'pm-6.12-rc1-2' of git://git.kernel..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10ff3507980000

#syz test

--- x/drivers/android/binder.c
+++ y/drivers/android/binder.c
@@ -6252,6 +6252,7 @@ static void binder_deferred_release(stru
 		ref = rb_entry(n, struct binder_ref, rb_node_desc);
 		outgoing_refs++;
 		binder_cleanup_ref_olocked(ref);
+		binder_dequeue_work(proc, &ref->freeze->work);
 		binder_proc_unlock(proc);
 		binder_free_ref(ref);
 		binder_proc_lock(proc);
--