[PATCH 4.9 35/96] RDS: null pointer dereference in rds_atomic_free_op

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mohamed Ghannam <simo.ghan...@gmail.com>


[ Upstream commit 7d11f77f84b27cef452cee332f4e469503084737 ]

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.ghan...@gmail.com>
Acked-by: Santosh Shilimkar <santosh.shilim...@oracle.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/rds/rdma.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -876,6 +876,7 @@ int rds_cmsg_atomic(struct rds_sock *rs,
 err:
        if (page)
                put_page(page);
+       rm->atomic.op_active = 0;
        kfree(rm->atomic.op_notifier);
 
        return ret;