Commit c6a012ba authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Greg Kroah-Hartman

ipvs: handle ip_vs_fill_iph_skb_off failure

commit 3f20efba upstream.

ip_vs_fill_iph_skb_off() may not find an IP header, and gcc has
determined that ip_vs_sip_fill_param() then incorrectly accesses
the protocol fields:

net/netfilter/ipvs/ip_vs_pe_sip.c: In function 'ip_vs_sip_fill_param':
net/netfilter/ipvs/ip_vs_pe_sip.c:76:5: error: 'iph.protocol' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  if (iph.protocol != IPPROTO_UDP)
     ^
net/netfilter/ipvs/ip_vs_pe_sip.c:81:10: error: 'iph.len' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  dataoff = iph.len + sizeof(struct udphdr);
          ^

This adds a check for the ip_vs_fill_iph_skb_off() return code
before looking at the ip header data returned from it.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Fixes: b0e010c5 ("ipvs: replace ip_vs_fill_ip4hdr with ip_vs_fill_iph_skb_off")
Acked-by: default avatarJulian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 23493843
......@@ -70,10 +70,10 @@ ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct sk_buff *skb)
const char *dptr;
int retc;
ip_vs_fill_iph_skb(p->af, skb, false, &iph);
retc = ip_vs_fill_iph_skb(p->af, skb, false, &iph);
/* Only useful with UDP */
if (iph.protocol != IPPROTO_UDP)
if (!retc || iph.protocol != IPPROTO_UDP)
return -EINVAL;
/* todo: IPv6 fragments:
* I think this only should be done for the first fragment. /HS
......
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