From: Kuniyuki Iwashima <kuniyu@amazon.com>
To: <edumazet@google.com>
Cc: <davem@davemloft.net>, <eric.dumazet@gmail.com>,
<kuba@kernel.org>, <kuniyu@amazon.com>, <netdev@vger.kernel.org>,
<pabeni@redhat.com>, <syzkaller@googlegroups.com>
Subject: Re: [PATCH net] rtnetlink: fix rtnl_dump_ifinfo() error path
Date: Thu, 21 Nov 2024 13:32:56 -0800 [thread overview]
Message-ID: <20241121213256.35057-1-kuniyu@amazon.com> (raw)
In-Reply-To: <20241121194105.3632507-1-edumazet@google.com>
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 21 Nov 2024 19:41:05 +0000
> syzbot found that rtnl_dump_ifinfo() could return with a lock held [1]
>
> Move code around so that rtnl_link_ops_put() and put_net()
> can be called at the end of this function.
>
> [1]
> WARNING: lock held when returning to user space!
> 6.12.0-rc7-syzkaller-01681-g38f83a57aa8e #0 Not tainted
> syz-executor399/5841 is leaving the kernel with locks still held!
> 1 lock held by syz-executor399/5841:
> #0: ffffffff8f46c2a0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
> #0: ffffffff8f46c2a0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
> #0: ffffffff8f46c2a0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:555
>
> Fixes: 43c7ce69d28e ("rtnetlink: Protect struct rtnl_link_ops with SRCU.")
> Reported-by: syzbot <syzkaller@googlegroups.com>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
I missed the error paths, thanks!
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
next prev parent reply other threads:[~2024-11-21 21:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-21 19:41 [PATCH net] rtnetlink: fix rtnl_dump_ifinfo() error path Eric Dumazet
2024-11-21 20:41 ` Joe Damato
2024-11-21 21:32 ` Kuniyuki Iwashima [this message]
2024-11-25 0:50 ` patchwork-bot+netdevbpf
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