[NETLINK]: Fix use after free in netlink_recvmsg
When the user passes in MSG_TRUNC the skb is used after getting freed.
Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>
---
commit 831e920626706afd5ced0c72ca15c8af340bc157
tree 1320e7a446a55e826f671d32e6b9f35e302eeb0d
parent dc87c3985e9b442c60994308a96f887579addc39
author Patrick McHardy <[EMAIL PROTECTED]> Wed, 02 May 2007 20:18:57 +0200
committer Patrick McHardy <[EMAIL PROTECTED]> Wed, 02 May 2007 20:18:57 +0200
net/netlink/af_netlink.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 42d2fb9..7419f70 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1245,16 +1245,14 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct
socket *sock,
siocb->scm = &scm;
}
siocb->scm->creds = *NETLINK_CREDS(skb);
+ if (flags & MSG_TRUNC)
+ copied = skb->len;
skb_free_datagram(sk, skb);
if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2)
netlink_dump(sk);
scm_recv(sock, msg, siocb->scm, flags);
-
- if (flags & MSG_TRUNC)
- copied = skb->len;
-
out:
netlink_rcv_wake(sk);
return err ? : copied;
-
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