From 06dc94b1ed05f91e246315afeb1c652d6d0dc9ab Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 3 Mar 2011 10:38:01 -0800 Subject: ipv4: Fix crash in dst_release when udp_sendmsg route lookup fails. As reported by Eric: [11483.697233] IP: [] dst_release+0x18/0x60 ... [11483.697741] Call Trace: [11483.697764] [] udp_sendmsg+0x282/0x6e0 [11483.697790] [] ? memcpy_toiovec+0x51/0x70 [11483.697818] [] ? ip_generic_getfrag+0x0/0xb0 The pointer passed to dst_release() is -EINVAL, that's because we leave an error pointer in the local variable "rt" by accident. NULL it out to fix the bug. Reported-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/udp.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/ipv4') diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 95e0c2c194a1..c9a73e5b26a3 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -925,6 +925,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, rt = ip_route_output_flow(net, &fl, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); + rt = NULL; if (err == -ENETUNREACH) IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); goto out; -- cgit v1.2.3