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authorLothar WaƟmann <LW@KARO-electronics.de>2009-07-14 23:10:21 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-15 11:20:37 -0700
commitf7e5cc0c40dff92bad2894153f675c6c542ba2f0 (patch)
treebd7e85854edeb3271f9a29f021392d7fdcc08bed /net/can
parent252aa9d94a04252046f3a382e6aca1b5c95921d8 (diff)
downloadlinux-2.6.38-lt-ux500-f7e5cc0c40dff92bad2894153f675c6c542ba2f0.tar.gz
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>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/bcm.c3
-rw-r--r--net/can/raw.c3
2 files changed, 6 insertions, 0 deletions
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 95d7f32643a..1d17e41b892 100644
--- 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 6aa154e806a..3482546e888 100644
--- 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);