diff options
| author | Li RongQing <lirongqing@baidu.com> | 2018-01-26 16:40:41 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-12 07:07:19 +0100 |
| commit | f76c9a0fbf5b54792313904e015b90e3ff25d343 (patch) | |
| tree | a57e6c545e56aed9e6405b28ddb90e644430a942 | |
| parent | b0acbef9edb2204fa65388fd703b24da702c6ce3 (diff) | |
| download | 96b-common-f76c9a0fbf5b54792313904e015b90e3ff25d343.tar.gz | |
tcp: release sk_frag.page in tcp_disconnect
[ Upstream commit 9b42d55a66d388e4dd5550107df051a9637564fc ]
socket can be disconnected and gets transformed back to a listening
socket, if sk_frag.page is not released, which will be cloned into
a new socket by sk_clone_lock, but the reference count of this page
is increased, lead to a use after free or double free issue
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/tcp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 8e053ad7cae2..c821f5d68720 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2434,6 +2434,12 @@ int tcp_disconnect(struct sock *sk, int flags) WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); + if (sk->sk_frag.page) { + put_page(sk->sk_frag.page); + sk->sk_frag.page = NULL; + sk->sk_frag.offset = 0; + } + sk->sk_error_report(sk); return err; } |