On Fri, 29 Sep 2006 02:45:33 +0200
Jesper Juhl [EMAIL PROTECTED] wrote:
Coverity found what looks like a real leak in
net/dccp/ipv6.c::dccp_v6_do_rcv()
We may leave via the return inside if (sk-sk_state == DCCP_OPEN) {
but at that point we may have allocated opt_skb, but we never free it
in that path before the return.
Signed-off-by: Jesper Juhl [EMAIL PROTECTED]
---
net/dccp/ipv6.c |2 ++
1 file changed, 2 insertions(+)
--- linux-2.6.18-git10-orig/net/dccp/ipv6.c 2006-09-28 22:40:07.0
+0200
+++ linux-2.6.18-git10/net/dccp/ipv6.c2006-09-29 02:35:15.0
+0200
@@ -997,6 +997,8 @@ static int dccp_v6_do_rcv(struct sock *s
if (sk-sk_state == DCCP_OPEN) { /* Fast path */
if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb-len))
goto reset;
+ if (opt_skb)
+ __kfree_skb(opt_skb);
return 0;
}
Looks right to me. But it'd be better coded as below, so we don't have
multiple deeply-nested return points (the cause of this bug) and duplicated
code.
otoh, it seems to me that opt_skb doesn't actually do anything and can be
removed?
diff -puN net/dccp/ipv6.c~ipv6-dccp-fix-memory-leak-in-dccp_v6_do_rcv
net/dccp/ipv6.c
--- a/net/dccp/ipv6.c~ipv6-dccp-fix-memory-leak-in-dccp_v6_do_rcv
+++ a/net/dccp/ipv6.c
@@ -997,7 +997,7 @@ static int dccp_v6_do_rcv(struct sock *s
if (sk-sk_state == DCCP_OPEN) { /* Fast path */
if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb-len))
goto reset;
- return 0;
+ goto out;
}
if (sk-sk_state == DCCP_LISTEN) {
@@ -1013,9 +1013,7 @@ static int dccp_v6_do_rcv(struct sock *s
if (nsk != sk) {
if (dccp_child_process(sk, nsk, skb))
goto reset;
- if (opt_skb != NULL)
- __kfree_skb(opt_skb);
- return 0;
+ goto out;
}
}
@@ -1026,9 +1024,10 @@ static int dccp_v6_do_rcv(struct sock *s
reset:
dccp_v6_ctl_send_reset(skb);
discard:
+ kfree_skb(skb);
+out:
if (opt_skb != NULL)
__kfree_skb(opt_skb);
- kfree_skb(skb);
return 0;
}
_
-
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