linux-kernel - [PATCH 3.16 120/136] RDS: null pointer dereference in rds_atomic_free

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Date:   Sun, 11 Feb 2018 04:31:11 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Mohamed Ghannam" <simo.ghannam@...il.com>,
        "Santosh Shilimkar" <santosh.shilimkar@...cle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 120/136] RDS: null pointer dereference in
 rds_atomic_free_op

3.16.54-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Mohamed Ghannam <simo.ghannam@...il.com>

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@...il.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/rds/rdma.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -855,6 +855,7 @@ 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;