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| author |   Eric Dumazet <edumazet@google.com> | 2017-08-25 06:27:05 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-08-25 17:22:01 -0700 |
| commit | bd9dfc54e39266ff67521c09d37e838077385b21 (patch) | |
| tree | 78b5d3dc4597f7056fa481dd9627bdd7ba2fee0c /net | |
| parent | Merge branch 'net_sched-clean-up-tc-classes-and-u32-filter' (diff) | |
| download | linux-dev-bd9dfc54e39266ff67521c09d37e838077385b21.tar.xz linux-dev-bd9dfc54e39266ff67521c09d37e838077385b21.zip | |
tcp: fix hang in tcp_sendpage_locked()
syszkaller got a hang in tcp stack, related to a bug in
tcp_sendpage_locked()
root@syzkaller:~# cat /proc/3059/stack
[<ffffffff83de926c>] __lock_sock+0x1dc/0x2f0
[<ffffffff83de9473>] lock_sock_nested+0xf3/0x110
[<ffffffff8408ce01>] tcp_sendmsg+0x21/0x50
[<ffffffff84163b6f>] inet_sendmsg+0x11f/0x5e0
[<ffffffff83dd8eea>] sock_sendmsg+0xca/0x110
[<ffffffff83dd9547>] kernel_sendmsg+0x47/0x60
[<ffffffff83de35dc>] sock_no_sendpage+0x1cc/0x280
[<ffffffff8408916b>] tcp_sendpage_locked+0x10b/0x160
[<ffffffff84089203>] tcp_sendpage+0x43/0x60
[<ffffffff841641da>] inet_sendpage+0x1aa/0x660
[<ffffffff83dd4fcd>] kernel_sendpage+0x8d/0xe0
[<ffffffff83dd50ac>] sock_sendpage+0x8c/0xc0
[<ffffffff81b63300>] pipe_to_sendpage+0x290/0x3b0
[<ffffffff81b67243>] __splice_from_pipe+0x343/0x750
[<ffffffff81b6a459>] splice_from_pipe+0x1e9/0x330
[<ffffffff81b6a5e0>] generic_splice_sendpage+0x40/0x50
[<ffffffff81b6b1d7>] SyS_splice+0x7b7/0x1610
[<ffffffff84d77a01>] entry_SYSCALL_64_fastpath+0x1f/0xbe
Fixes: 306b13eb3cf9 ("proto_ops: Add locked held versions of sendmsg and sendpage")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 0cce4472b4a1..566083ee2654 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1052,8 +1052,7 @@ int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, { if (!(sk->sk_route_caps & NETIF_F_SG) || !sk_check_csum_caps(sk)) - return sock_no_sendpage(sk->sk_socket, page, offset, size, - flags); + return sock_no_sendpage_locked(sk, page, offset, size, flags); tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |