tcp: Fix OOB POLLIN avoidance.

[ Upstream commit b634f87522dff87712df8bda2a6c9061954d552a ]

From: Alexandra.Kossovsky@oktetlabs.ru

Fixes kernel bugzilla #15541

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 225df28633ca..564a0f87cd66 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -429,7 +429,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
                 if (tp->urg_seq == tp->copied_seq &&
                     !sock_flag(sk, SOCK_URGINLINE) &&
                     tp->urg_data)
-                        target--;
+                        target++;
 
                 /* Potential race condition. If read of tp below will
                  * escape above sk->sk_state, we can be illegally awaken