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authorEric W. Biederman <ebiederm@xmission.com>2015-05-22 04:58:12 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-06-22 17:01:17 -0700
commit88ad5b3e94ab2fba5bfc2ad4604b15b0aa079a13 (patch)
tree56ae1bc50c43eaad8ad22cf7d97a3e3739030671 /net
parent38196b3cb4e9b8e0beb7b30ce39880f0b666f431 (diff)
ipv4: Avoid crashing in ip_error
[ Upstream commit 381c759d9916c42959515ad34a6d467e24a88e93 ] ip_error does not check if in_dev is NULL before dereferencing it. IThe following sequence of calls is possible: CPU A CPU B ip_rcv_finish ip_route_input_noref() ip_route_input_slow() inetdev_destroy() dst_input() With the result that a network device can be destroyed while processing an input packet. A crash was triggered with only unicast packets in flight, and forwarding enabled on the only network device. The error condition was created by the removal of the network device. As such it is likely the that error code was -EHOSTUNREACH, and the action taken by ip_error (if in_dev had been accessible) would have been to not increment any counters and to have tried and likely failed to send an icmp error as the network device is going away. Therefore handle this weird case by just dropping the packet if !in_dev. It will result in dropping the packet sooner, and will not result in an actual change of behavior. Fixes: 251da4130115b ("ipv4: Cache ip_error() routes even when not forwarding.") Reported-by: Vittorio Gambaletta <linuxbugs@vittgam.net> Tested-by: Vittorio Gambaletta <linuxbugs@vittgam.net> Signed-off-by: Vittorio Gambaletta <linuxbugs@vittgam.net> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b64330f25fbe..625615cdac86 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -910,6 +910,10 @@ static int ip_error(struct sk_buff *skb)
bool send;
int code;
+ /* IP on this device is disabled. */
+ if (!in_dev)
+ goto out;
+
net = dev_net(rt->dst.dev);
if (!IN_DEV_FORWARD(in_dev)) {
switch (rt->dst.error) {