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| author | Li RongQing <lirongqing@baidu.com> | 2018-01-26 16:40:41 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-29 17:56:23 -0500 |
| commit | 9b42d55a66d388e4dd5550107df051a9637564fc (patch) | |
| tree | 685bd712d0a69e853828cb0c0331577c3c7e5df0 /net/ipv4 | |
| parent | 30e948a37839c633d18f6c4cf8a212912ba9449c (diff) | |
| download | linux-9b42d55a66d388e4dd5550107df051a9637564fc.tar.gz linux-9b42d55a66d388e4dd5550107df051a9637564fc.tar.bz2 linux-9b42d55a66d388e4dd5550107df051a9637564fc.zip | |
tcp: release sk_frag.page in tcp_disconnect
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>
Diffstat (limited to 'net/ipv4')
| -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 c8ed3a04b504..874c9317b8df 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2458,6 +2458,12 @@ 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; } |