net/can bugfix: use after free bug in can protocol drivers

Fix a use after free bug in can protocol drivers

The release functions of the can protocol drivers lack a call to
sock_orphan() which leads to referencing freed memory under certain
circumstances.

This patch fixes a bug reported here:
https://lists.berlios.de/pipermail/socketcan-users/2009-July/000985.html

Signed-off-by: Lothar Wassmann <LW@KARO-electronics.de>
Acked-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 95d7f32..1d17e41 100644 (file)
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1469,6 +1469,9 @@ static int bcm_release(struct socket *sock)
                bo->ifindex = 0;
        }
 
+       sock_orphan(sk);
+       sock->sk = NULL;
+
        release_sock(sk);
        sock_put(sk);
 

diff --git a/net/can/raw.c b/net/can/raw.c
index 6aa154e..3482546 100644 (file)
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -306,6 +306,9 @@ static int raw_release(struct socket *sock)
        ro->bound   = 0;
        ro->count   = 0;
 
+       sock_orphan(sk);
+       sock->sk = NULL;
+
        release_sock(sk);
        sock_put(sk);