Commit cd27b96b authored Feb 13, 2017 by WANG Cong Committed by David S. Miller Feb 14, 2017

kcm: fix a null pointer dereference in kcm_sendmsg()



In commit 98e3862c ("kcm: fix 0-length case for kcm_sendmsg()")
I tried to avoid skb allocation for 0-length case, but missed
a check for NULL pointer in the non EOR case.

Fixes: 98e3862c ("kcm: fix 0-length case for kcm_sendmsg()")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 01f8902b

net/kcm/kcmsock.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -1044,9 +1044,11 @@ static int kcm_sendmsg(struct socket sock, struct msghdr msg, size_t len)
		} else {
		/* Message not complete, save state */
		partial_message:
		if (head) {
		kcm->seq_skb = head;
		kcm_tx_msg(head)->last_skb = skb;
		}
		}

		KCM_STATS_ADD(kcm->stats.tx_bytes, copied);