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tcp: fix recv with flags MSG_WAITALL | MSG_PEEK

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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>
This commit is contained in:
Sabrina Dubroca
2015-07-24 18:19:25 +02:00
committed by David S. Miller
parent 3d3af88592
commit dfbafc9953
5 changed files with 14 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/llc/af_llc.c
+2 -2
View File
@@ -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",