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authorHerbert Xu <herbert@gondor.apana.org.au>2005-10-16 21:08:46 +1000
committerArnaldo Carvalho de Melo <acme@mandriva.com>2005-10-20 14:44:29 -0200
commitffa29347dfbc158d1f47f5925324a6f5713659c1 (patch)
tree66c0360d21cc842af830b9c7ffd6e924652e7ce3
parentfda0fd6c5b722cc48e904e0daafedca275d332af (diff)
[DCCP]: Make dccp_write_xmit always free the packet
icmp_send doesn't use skb->sk at all so even if skb->sk has already been freed it can't cause crash there (it would've crashed somewhere else first, e.g., ip_queue_xmit). I found a double-free on an skb that could explain this though. dccp_sendmsg and dccp_write_xmit are a little confused as to what should free the packet when something goes wrong. Sometimes they both go for the ball and end up in each other's way. This patch makes dccp_write_xmit always free the packet no matter what. This makes sense since dccp_transmit_skb which in turn comes from the fact that ip_queue_xmit always frees the packet. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
-rw-r--r--net/dccp/output.c3
-rw-r--r--net/dccp/proto.c2
2 files changed, 2 insertions, 3 deletions
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 946ec2db75d..7006549f705 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -241,7 +241,8 @@ int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo)
err = dccp_transmit_skb(sk, skb);
ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
- }
+ } else
+ kfree_skb(skb);
return err;
}
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index a1cfd0e9e3b..a021c3422f6 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -402,8 +402,6 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
* This bug was _quickly_ found & fixed by just looking at an OSTRA
* generated callgraph 8) -acme
*/
- if (rc != 0)
- goto out_discard;
out_release:
release_sock(sk);
return rc ? : len;