asgardius/android_kernel_motorola_sm6225
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inet: Don't go into port scan when looking for specific bind port

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inet_csk_get_port is called with port number (snum argument) that may be
zero or nonzero. If it is zero, then the intent is to find an available
ephemeral port number to bind to. If snum is non-zero then the caller
is asking to allocate a specific port number. In the latter case we
never want to perform the scan in ephemeral port range. It is
conceivable that this can happen if the "goto again" in "tb_found:"
is done. This patch adds a check that snum is zero before doing
the "goto again".

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2016-12-14 16:54:15 -08:00 committed by David S. Miller
parent 0eb6984f70
commit 9af7e923fd
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/inet_connection_sock.c
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@ -212,7 +212,7 @@ tb_found:
sk->sk_reuseport &&
!rcu_access_pointer(sk->sk_reuseport_cb) &&
uid_eq(tb->fastuid, uid))) &&
smallest_size != -1 && --attempts >= 0) {
!snum && smallest_size != -1 && --attempts >= 0) {
spin_unlock_bh(&head->lock);
goto again;
}