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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/ip6_offload.c | |
| parent | 579f1d926c66cc0bd3bd87b1fe2e091084b07430 (diff) | |
| download | lwn-7dd7eb9513bd02184d45f000ab69d78cb1fa1531.tar.gz lwn-7dd7eb9513bd02184d45f000ab69d78cb1fa1531.zip | |
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/ip6_offload.c')
| -rw-r--r-- | net/ipv6/ip6_offload.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index eab36abc9f22..280268f1dd7b 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -63,7 +63,6 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, const struct net_offload *ops; int proto; struct frag_hdr *fptr; - unsigned int unfrag_ip6hlen; unsigned int payload_len; u8 *prevhdr; int offset = 0; @@ -116,10 +115,10 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, skb->network_header = (u8 *)ipv6h - skb->head; if (udpfrag) { - unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); - if (unfrag_ip6hlen < 0) - return ERR_PTR(unfrag_ip6hlen); - fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen); + int err = ip6_find_1stfragopt(skb, &prevhdr); + if (err < 0) + return ERR_PTR(err); + fptr = (struct frag_hdr *)((u8 *)ipv6h + err); fptr->frag_off = htons(offset); if (skb->next) fptr->frag_off |= htons(IP6_MF); |