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| author | David S. Miller <davem@davemloft.net> | 2017-05-17 22:54:11 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-17 22:54:11 -0400 |
| commit | 7dd7eb9513bd02184d45f000ab69d78cb1fa1531 (patch) | |
| tree | 069fed66bdc18c6043c981748bb28057fbc1bcf2 /net/ipv6/udp_offload.c | |
| parent | 579f1d926c66cc0bd3bd87b1fe2e091084b07430 (diff) | |
| download | linux-7dd7eb9513bd02184d45f000ab69d78cb1fa1531.tar.bz2 | |
ipv6: Check ip6_find_1stfragopt() return value properly.
Do not use unsigned variables to see if it returns a negative
error or not.
Fixes: 2423496af35d ("ipv6: Prevent overrun when parsing v6 header options")
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp_offload.c')
| -rw-r--r-- | net/ipv6/udp_offload.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index b348cff47395..a2267f80febb 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -29,6 +29,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, u8 frag_hdr_sz = sizeof(struct frag_hdr); __wsum csum; int tnl_hlen; + int err; mss = skb_shinfo(skb)->gso_size; if (unlikely(skb->len <= mss)) @@ -90,9 +91,10 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, /* Find the unfragmentable header and shift it left by frag_hdr_sz * bytes to insert fragment header. */ - unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); - if (unfrag_ip6hlen < 0) - return ERR_PTR(unfrag_ip6hlen); + err = ip6_find_1stfragopt(skb, &prevhdr); + if (err < 0) + return ERR_PTR(err); + unfrag_ip6hlen = err; nexthdr = *prevhdr; *prevhdr = NEXTHDR_FRAGMENT; unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) + |