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author | Arnd Bergmann <arnd@arndb.de> | 2016-01-27 14:52:02 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-11 11:21:09 +0200 |
commit | c6a012ba56536cac022045cab504d76d342d8c91 (patch) | |
tree | 59fea519e1edd832aa91d772c483d07738f9ded7 /net/netfilter | |
parent | 2349384312b4192c5200d16f6089921fb4ffb7d8 (diff) | |
download | linux-stable-c6a012ba56536cac022045cab504d76d342d8c91.tar.gz linux-stable-c6a012ba56536cac022045cab504d76d342d8c91.tar.bz2 linux-stable-c6a012ba56536cac022045cab504d76d342d8c91.zip |
ipvs: handle ip_vs_fill_iph_skb_off failure
commit 3f20efba41916ee17ce82f0fdd02581ada2872b2 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: Arnd Bergmann <arnd@arndb.de>
Fixes: b0e010c527de ("ipvs: replace ip_vs_fill_ip4hdr with ip_vs_fill_iph_skb_off")
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_pe_sip.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/netfilter/ipvs/ip_vs_pe_sip.c b/net/netfilter/ipvs/ip_vs_pe_sip.c index 1b8d594e493a..c4e9ca016a88 100644 --- a/net/netfilter/ipvs/ip_vs_pe_sip.c +++ b/net/netfilter/ipvs/ip_vs_pe_sip.c @@ -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 |