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authorHerbert Xu <herbert@gondor.apana.org.au>2007-10-17 21:30:34 -0700
committerDavid S. Miller <davem@davemloft.net>2007-10-17 21:30:34 -0700
commit440725000cba0b1a68ca2df20124be3a5b7f7702 (patch)
treeae278e1b2b5aaed8f1e9d55e91c2913cde5ac653
parent7aa68cb90638ccc36559a936814e4c089892b3d9 (diff)
downloadlinux-440725000cba0b1a68ca2df20124be3a5b7f7702.tar.bz2
[IPSEC]: Fix length check in xfrm_parse_spi
Currently xfrm_parse_spi requires there to be 16 bytes for AH and ESP. In contrived cases there may not actually be 16 bytes there since the respective header sizes are less than that (8 and 12 currently). This patch changes the test to use the actual header length instead of 16. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/xfrm/xfrm_input.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 113f44429982..cb97fda1b6df 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -49,13 +49,16 @@ EXPORT_SYMBOL(secpath_dup);
int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
{
int offset, offset_seq;
+ int hlen;
switch (nexthdr) {
case IPPROTO_AH:
+ hlen = sizeof(struct ip_auth_hdr);
offset = offsetof(struct ip_auth_hdr, spi);
offset_seq = offsetof(struct ip_auth_hdr, seq_no);
break;
case IPPROTO_ESP:
+ hlen = sizeof(struct ip_esp_hdr);
offset = offsetof(struct ip_esp_hdr, spi);
offset_seq = offsetof(struct ip_esp_hdr, seq_no);
break;
@@ -69,7 +72,7 @@ int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
return 1;
}
- if (!pskb_may_pull(skb, 16))
+ if (!pskb_may_pull(skb, hlen))
return -EINVAL;
*spi = *(__be32*)(skb_transport_header(skb) + offset);