From: Alexey Kodanev Date: Tue, 6 Mar 2018 19:57:01 +0000 (+0300) Subject: dccp: check sk for closed state in dccp_sendmsg() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=91d27e0c302501e148460db9981b5b04481781ce;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git dccp: check sk for closed state in dccp_sendmsg() [ Upstream commit 67f93df79aeefc3add4e4b31a752600f834236e2 ] dccp_disconnect() sets 'dp->dccps_hc_tx_ccid' tx handler to NULL, therefore if DCCP socket is disconnected and dccp_sendmsg() is called after it, it will cause a NULL pointer dereference in dccp_write_xmit(). This crash and the reproducer was reported by syzbot. Looks like it is reproduced if commit 69c64866ce07 ("dccp: CVE-2017-8824: use-after-free in DCCP code") is applied. Reported-by: syzbot+f99ab3887ab65d70f816@syzkaller.appspotmail.com Signed-off-by: Alexey Kodanev Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/dccp/proto.c b/net/dccp/proto.c index 9d43c1f40274..ff3b058cf58c 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -789,6 +789,11 @@ int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (skb == NULL) goto out_release; + if (sk->sk_state == DCCP_CLOSED) { + rc = -ENOTCONN; + goto out_discard; + } + skb_reserve(skb, sk->sk_prot->max_header); rc = memcpy_from_msg(skb_put(skb, len), msg, len); if (rc != 0)