From: Mohamed Ghannam <simo.ghannam@gmail.com>
Date: Wed, 3 Jan 2018 21:06:06 +0000 (+0000)
Subject: RDS: null pointer dereference in rds_atomic_free_op
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57e49cc5d8048f4274b3b2c8ec075f656f8a3ed1;p=pandora-kernel.git

RDS: null pointer dereference in rds_atomic_free_op

commit 7d11f77f84b27cef452cee332f4e469503084737 upstream.

set rm->atomic.op_active to 0 when rds_pin_pages() fails
or the user supplied address is invalid,
this prevents a NULL pointer usage in rds_atomic_free_op()

Signed-off-by: Mohamed Ghannam <simo.ghannam@gmail.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 6bb8a4ca3b7a..6fcd65a923ea 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -855,6 +855,7 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
 err:
 	if (page)
 		put_page(page);
+	rm->atomic.op_active = 0;
 	kfree(rm->atomic.op_notifier);
 
 	return ret;