[PATCH 3.12 073/119] mISDN: Fixing missing validation in base_sock_bind()

[Jiri Slaby]

From: Emrah Demir <e...@abdsec.com>

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

===============

commit b821646826e22f0491708768fccce58eef3f5704 upstream.

Add validation code into mISDN/socket.c

Signed-off-by: Emrah Demir <e...@abdsec.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Cc: Oliver Neukum <oli...@neukum.org>
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
 drivers/isdn/mISDN/socket.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index 5cefb479c707..00bd80a63895 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -717,6 +717,9 @@ base_sock_bind(struct socket *sock, struct sockaddr *addr, 
int addr_len)
        if (!maddr || maddr->family != AF_ISDN)
                return -EINVAL;
 
+       if (addr_len < sizeof(struct sockaddr_mISDN))
+               return -EINVAL;
+
        lock_sock(sk);
 
        if (_pms(sk)->dev) {
-- 
2.10.0