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Date: Thu, 18 May 2017 10:01:07 +0800 (SGT)
From: Julia Lawall <julia.lawall@...6.fr>
To: Craig Gallek <kraig@...gle.com>
cc: netdev@...r.kernel.org, kbuild-all@...org
Subject: [net:master 9/12] net/ipv6/ip6_offload.c:120:7-21: WARNING: Unsigned
expression compared with zero: unfrag_ip6hlen < 0 (fwd)
Hello,
It may be worth checking on these. The code context is shown in the first
case (line 120). For the others, at least it gives the line numbers.
julia
---------- Forwarded message ----------
Date: Thu, 18 May 2017 09:07:31 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: kbuild@...org
Cc: Julia Lawall <julia.lawall@...6.fr>
Subject: [net:master 9/12] net/ipv6/ip6_offload.c:120:7-21: WARNING: Unsigned
expression compared with zero: unfrag_ip6hlen < 0
CC: kbuild-all@...org
CC: netdev@...r.kernel.org
TO: Craig Gallek <kraig@...gle.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git master
head: 579f1d926c66cc0bd3bd87b1fe2e091084b07430
commit: 2423496af35d94a87156b063ea5cedffc10a70a1 [9/12] ipv6: Prevent overrun when parsing v6 header options
:::::: branch date: 2 hours ago
:::::: commit date: 6 hours ago
>> net/ipv6/ip6_offload.c:120:7-21: WARNING: Unsigned expression compared with zero: unfrag_ip6hlen < 0
--
>> net/ipv6/ip6_output.c:601:5-9: WARNING: Unsigned expression compared with zero: hlen < 0
--
>> net/ipv6/udp_offload.c:94:6-20: WARNING: Unsigned expression compared with zero: unfrag_ip6hlen < 0
git remote add net https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git
git remote update net
git checkout 2423496af35d94a87156b063ea5cedffc10a70a1
vim +120 net/ipv6/ip6_offload.c
d1da932e Vlad Yasevich 2012-11-15 104
07b26c94 Steffen Klassert 2016-09-19 105 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
07b26c94 Steffen Klassert 2016-09-19 106
d1da932e Vlad Yasevich 2012-11-15 107 for (skb = segs; skb; skb = skb->next) {
d3e5e006 Eric Dumazet 2013-10-20 108 ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
07b26c94 Steffen Klassert 2016-09-19 109 if (gso_partial)
802ab55a Alexander Duyck 2016-04-10 110 payload_len = skb_shinfo(skb)->gso_size +
802ab55a Alexander Duyck 2016-04-10 111 SKB_GSO_CB(skb)->data_offset +
802ab55a Alexander Duyck 2016-04-10 112 skb->head - (unsigned char *)(ipv6h + 1);
802ab55a Alexander Duyck 2016-04-10 113 else
802ab55a Alexander Duyck 2016-04-10 114 payload_len = skb->len - nhoff - sizeof(*ipv6h);
802ab55a Alexander Duyck 2016-04-10 115 ipv6h->payload_len = htons(payload_len);
d3e5e006 Eric Dumazet 2013-10-20 116 skb->network_header = (u8 *)ipv6h - skb->head;
d3e5e006 Eric Dumazet 2013-10-20 117
91a48a2e Hannes Frederic Sowa 2014-02-24 118 if (udpfrag) {
d1da932e Vlad Yasevich 2012-11-15 119 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
2423496a Craig Gallek 2017-05-16 @120 if (unfrag_ip6hlen < 0)
2423496a Craig Gallek 2017-05-16 121 return ERR_PTR(unfrag_ip6hlen);
d3e5e006 Eric Dumazet 2013-10-20 122 fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
d1da932e Vlad Yasevich 2012-11-15 123 fptr->frag_off = htons(offset);
53b24b8f Ian Morris 2015-03-29 124 if (skb->next)
d1da932e Vlad Yasevich 2012-11-15 125 fptr->frag_off |= htons(IP6_MF);
d1da932e Vlad Yasevich 2012-11-15 126 offset += (ntohs(ipv6h->payload_len) -
d1da932e Vlad Yasevich 2012-11-15 127 sizeof(struct frag_hdr));
d1da932e Vlad Yasevich 2012-11-15 128 }
---
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