From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+5a630f8ca0120ab43f55@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in __unix_gc
Date: Sat, 10 Feb 2024 14:35:25 +0800 [thread overview]
Message-ID: <20240210063527.792-1-hdanton@sina.com> (raw)
In-Reply-To: <000000000000ee09930610f42470@google.com>
On Fri, 09 Feb 2024 06:57:17 -0800
> HEAD commit: e7689879d14e ethtool: do not use rtnl in ethnl_default_dum..
> git tree: net-next
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165f9cec180000
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main
--- x/net/unix/garbage.c
+++ y/net/unix/garbage.c
@@ -119,6 +119,7 @@ void unix_inflight(struct user_struct *u
if (!u->inflight) {
WARN_ON_ONCE(!list_empty(&u->link));
list_add_tail(&u->link, &gc_inflight_list);
+ sock_hold(&u->sk);
} else {
WARN_ON_ONCE(list_empty(&u->link));
}
@@ -350,6 +351,11 @@ static void __unix_gc(struct work_struct
}
#endif
+ list_for_each_entry_safe(u, next, &gc_candidates, link) {
+ list_del(&u->link);
+ sock_put(&u->sk);
+ }
+
spin_lock(&unix_gc_lock);
/* All candidates should have been detached by now. */
--
next prev parent reply other threads:[~2024-02-10 6:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-09 14:57 [syzbot] [kernel?] KASAN: slab-use-after-free Read in __unix_gc syzbot
2024-02-10 2:24 ` Hillf Danton
2024-02-10 4:08 ` syzbot
2024-02-10 6:35 ` Hillf Danton [this message]
2024-02-10 7:03 ` syzbot
2024-02-10 8:10 ` Kuniyuki Iwashima
2024-02-10 10:07 ` Hillf Danton
2024-02-10 11:39 ` syzbot
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