Patch "kcm: fix a null pointer dereference in kcm_sendmsg()" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

kcm: fix a null pointer dereference in kcm_sendmsg()

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
kcm-fix-a-null-pointer-dereference-in-kcm_sendmsg.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: WANG Cong <[email protected]>
Date: Mon, 13 Feb 2017 11:13:16 -0800
Subject: kcm: fix a null pointer dereference in kcm_sendmsg()

From: WANG Cong <[email protected]>

[ Upstream commit cd27b96bc13841ee7af25837a6ae86fee87273d6 ]

In commit 98e3862ca2b1 ("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.

---
 net/kcm/kcmsock.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

@@ -1044,8 +1044,10 @@ wait_for_memory:
 	} else {
 		/* Message not complete, save state */
 partial_message:
-		kcm->seq_skb = head;
-		kcm_tx_msg(head)->last_skb = skb;
+		if (head) {
+			kcm->seq_skb = head;
+			kcm_tx_msg(head)->last_skb = skb;
+		}
 	}
 
 	KCM_STATS_ADD(kcm->stats.tx_bytes, copied);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/kcm-fix-0-length-case-for-kcm_sendmsg.patch queue-4.9/kcm-fix-a-null-pointer-dereference-in-kcm_sendmsg.patch