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authorStephen Hemminger <shemminger@osdl.org>2006-08-09 03:48:51 +0400
committerDavid S. Miller <davem@davemloft.net>2006-08-09 03:48:51 +0400
commit7b1ba8de569460894efa892457af7a37c0d574f9 (patch)
tree8739f17110b12aedf5f3067c3dba1f3350727f7a
parent70f8e78e150425b01c1099087ad3decacf7e4ccf (diff)
downloadlinux-7b1ba8de569460894efa892457af7a37c0d574f9.tar.xz
[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.c7
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;