3.16.72-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Steffen Klassert <[email protected]> commit ea673a4d3a337184f3c314dcc6300bf02f39e077 upstream. A call to pskb_may_pull may change the pointers into the packet, so reload the pointers after the call. Signed-off-by: Steffen Klassert <[email protected]> Signed-off-by: Ben Hutchings <[email protected]> --- net/ipv4/xfrm4_policy.c | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -123,7 +123,10 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_DCCP: if (xprth + 4 < skb->data || pskb_may_pull(skb, xprth + 4 - skb->data)) { - __be16 *ports = (__be16 *)xprth; + __be16 *ports; + + xprth = skb_network_header(skb) + iph->ihl * 4; + ports = (__be16 *)xprth; fl4->fl4_sport = ports[!!reverse]; fl4->fl4_dport = ports[!reverse]; @@ -133,7 +136,10 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_ICMP: if (xprth + 2 < skb->data || pskb_may_pull(skb, xprth + 2 - skb->data)) { - u8 *icmp = xprth; + u8 *icmp; + + xprth = skb_network_header(skb) + iph->ihl * 4; + icmp = xprth; fl4->fl4_icmp_type = icmp[0]; fl4->fl4_icmp_code = icmp[1]; @@ -143,7 +149,10 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_ESP: if (xprth + 4 < skb->data || pskb_may_pull(skb, xprth + 4 - skb->data)) { - __be32 *ehdr = (__be32 *)xprth; + __be32 *ehdr; + + xprth = skb_network_header(skb) + iph->ihl * 4; + ehdr = (__be32 *)xprth; fl4->fl4_ipsec_spi = ehdr[0]; } @@ -152,7 +161,10 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_AH: if (xprth + 8 < skb->data || pskb_may_pull(skb, xprth + 8 - skb->data)) { - __be32 *ah_hdr = (__be32 *)xprth; + __be32 *ah_hdr; + + xprth = skb_network_header(skb) + iph->ihl * 4; + ah_hdr = (__be32 *)xprth; fl4->fl4_ipsec_spi = ah_hdr[1]; } @@ -161,7 +173,10 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_COMP: if (xprth + 4 < skb->data || pskb_may_pull(skb, xprth + 4 - skb->data)) { - __be16 *ipcomp_hdr = (__be16 *)xprth; + __be16 *ipcomp_hdr; + + xprth = skb_network_header(skb) + iph->ihl * 4; + ipcomp_hdr = (__be16 *)xprth; fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1])); } @@ -170,8 +185,12 @@ _decode_session4(struct sk_buff *skb, st case IPPROTO_GRE: if (xprth + 12 < skb->data || pskb_may_pull(skb, xprth + 12 - skb->data)) { - __be16 *greflags = (__be16 *)xprth; - __be32 *gre_hdr = (__be32 *)xprth; + __be16 *greflags; + __be32 *gre_hdr; + + xprth = skb_network_header(skb) + iph->ihl * 4; + greflags = (__be16 *)xprth; + gre_hdr = (__be32 *)xprth; if (greflags[0] & GRE_KEY) { if (greflags[0] & GRE_CSUM)
