diff options
| author | Stephen Hemminger | 2006-08-08 16:48:51 -0700 |
|---|---|---|
| committer | David S. Miller | 2006-08-08 16:48:51 -0700 |
| commit | 7b1ba8de569460894efa892457af7a37c0d574f9 (patch) | |
| tree | 8739f17110b12aedf5f3067c3dba1f3350727f7a | |
| parent | 70f8e78e150425b01c1099087ad3decacf7e4ccf (diff) | |
[IPX]: Another nonlinear receive fix
Need to check some more cases in IPX receive. If the skb is purely
fragments, the IPX header needs to be extracted. The function
pskb_may_pull() may in theory invalidate all the pointers in the skb,
so references to ipx header must be refreshed.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipx/af_ipx.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c index c13e86b14f69..401964204866 100644 --- a/net/ipx/af_ipx.c +++ b/net/ipx/af_ipx.c @@ -1642,14 +1642,17 @@ static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_ty if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) goto out; - ipx = ipx_hdr(skb); - ipx_pktsize = ntohs(ipx->ipx_pktsize); + if (!pskb_may_pull(skb, sizeof(struct ipxhdr))) + goto drop; + + ipx_pktsize = ntohs(ipxhdr(skb)->ipx_pktsize); /* Too small or invalid header? */ if (ipx_pktsize < sizeof(struct ipxhdr) || !pskb_may_pull(skb, ipx_pktsize)) goto drop; + ipx = ipx_hdr(skb); if (ipx->ipx_checksum != IPX_NO_CHECKSUM && ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize)) goto drop; |