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| author | Sabrina Dubroca <sd@queasysnail.net> | 2015-07-24 18:19:25 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-27 01:06:53 -0700 |
| commit | dfbafc995304ebb9a9b03f65083e6e9cea143b20 (patch) | |
| tree | db3c54339548ef9e9e9b053e3c5d2f77c1dc560f /net/llc | |
| parent | 3d3af8859284f982ad62980b3787f05259f1dd10 (diff) | |
| download | linux-stable-dfbafc995304ebb9a9b03f65083e6e9cea143b20.tar.gz linux-stable-dfbafc995304ebb9a9b03f65083e6e9cea143b20.tar.bz2 linux-stable-dfbafc995304ebb9a9b03f65083e6e9cea143b20.zip | |
tcp: fix recv with flags MSG_WAITALL | MSG_PEEK
Currently, tcp_recvmsg enters a busy loop in sk_wait_data if called
with flags = MSG_WAITALL | MSG_PEEK.
sk_wait_data waits for sk_receive_queue not empty, but in this case,
the receive queue is not empty, but does not contain any skb that we
can use.
Add a "last skb seen on receive queue" argument to sk_wait_data, so
that it sleeps until the receive queue has new skbs.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=99461
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=18493
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1205258
Reported-by: Enrico Scholz <rh-bugzilla@ensc.de>
Reported-by: Dan Searle <dan@censornet.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc')
| -rw-r--r-- | net/llc/af_llc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c index 8fd9febaa5ba..8dab4e569571 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -613,7 +613,7 @@ static int llc_wait_data(struct sock *sk, long timeo) if (signal_pending(current)) break; rc = 0; - if (sk_wait_data(sk, &timeo)) + if (sk_wait_data(sk, &timeo, NULL)) break; } return rc; @@ -802,7 +802,7 @@ static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, release_sock(sk); lock_sock(sk); } else - sk_wait_data(sk, &timeo); + sk_wait_data(sk, &timeo, NULL); if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |