raw: Raw socket leak.

The program below just leaks the raw kernel socket

int main() {
        int fd = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
        struct sockaddr_in addr;

        memset(&addr, 0, sizeof(addr));
        inet_aton("127.0.0.1", &addr.sin_addr);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(2048);
        sendto(fd,  "a", 1, MSG_MORE, &addr, sizeof(addr));
        return 0;
}

Corked packet is allocated via sock_wmalloc which holds the owner socket,
so one should uncork it and flush all pending data on close. Do this in the
same way as in UDP.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index fead049daf43..e7e091d365ff 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -608,6 +608,14 @@ static void raw_close(struct sock *sk, long timeout)
         sk_common_release(sk);
 }
 
+static int raw_destroy(struct sock *sk)
+{
+        lock_sock(sk);
+        ip_flush_pending_frames(sk);
+        release_sock(sk);
+        return 0;
+}
+
 /* This gets rid of all the nasties in af_inet. -DaveM */
 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
@@ -820,6 +828,7 @@ struct proto raw_prot = {
         .name              = "RAW",
         .owner             = THIS_MODULE,
         .close             = raw_close,
+        .destroy           = raw_destroy,
         .connect           = ip4_datagram_connect,
         .disconnect        = udp_disconnect,
         .ioctl             = raw_ioctl,