diff options
| author | Eric Dumazet | 2018-10-02 08:24:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2018-12-01 09:37:28 +0100 |
| commit | cddcc9959a32999ce2d38018900595a5ab453eb2 (patch) | |
| tree | 9b32d515c35c86a1d78d460eb5006d675a927dd8 /net/core | |
| parent | mm/memory.c: recheck page table entry with page table lock held (diff) | |
| download | kernel-qcow2-linux-cddcc9959a32999ce2d38018900595a5ab453eb2.tar.gz kernel-qcow2-linux-cddcc9959a32999ce2d38018900595a5ab453eb2.tar.xz kernel-qcow2-linux-cddcc9959a32999ce2d38018900595a5ab453eb2.zip | |
tcp: do not release socket ownership in tcp_close()
commit 8873c064d1de579ea23412a6d3eee972593f142b upstream.
syzkaller was able to hit the WARN_ON(sock_owned_by_user(sk));
in tcp_close()
While a socket is being closed, it is very possible other
threads find it in rtnetlink dump.
tcp_get_info() will acquire the socket lock for a short amount
of time (slow = lock_sock_fast(sk)/unlock_sock_fast(sk, slow);),
enough to trigger the warning.
Fixes: 67db3e4bfbc9 ("tcp: no longer hold ehash lock while calling tcp_get_info()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/sock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 3730eb855095..748765e35423 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2317,7 +2317,7 @@ static void __lock_sock(struct sock *sk) finish_wait(&sk->sk_lock.wq, &wait); } -static void __release_sock(struct sock *sk) +void __release_sock(struct sock *sk) __releases(&sk->sk_lock.slock) __acquires(&sk->sk_lock.slock) { |