Messages in this thread | | | Subject | Re: [PATCH v3 net] ipv6: Fix dangling pointer when ipv6 fragment | From | hujunwei <> | Date | Wed, 3 Apr 2019 14:47:19 +0800 |
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On 2019/4/3 13:01, Dan Carpenter wrote: > Hi hujunwei, > > url: https://github.com/0day-ci/linux/commits/hujunwei/ipv6-Fix-dangling-pointer-when-ipv6-fragment/20190402-175602 > > New smatch warnings: > net/ipv6/ip6_output.c:609 ip6_fragment() error: uninitialized symbol 'prevhdr'. > > Old smatch warnings: > net/ipv6/ip6_output.c:247 ip6_xmit() error: we previously assumed 'np' could be null (see line 241) > > # https://github.com/0day-ci/linux/commit/7f25fe5b3011737e52e4d8b4a2dfcafd46677115 > git remote add linux-review https://github.com/0day-ci/linux > git remote update linux-review > git checkout 7f25fe5b3011737e52e4d8b4a2dfcafd46677115 > vim +/prevhdr +609 net/ipv6/ip6_output.c > > ^1da177e4 Linus Torvalds 2005-04-16 594 > 7d8c6e391 Eric W. Biederman 2015-06-12 595 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, > 7d8c6e391 Eric W. Biederman 2015-06-12 596 int (*output)(struct net *, struct sock *, struct sk_buff *)) > ^1da177e4 Linus Torvalds 2005-04-16 597 { > ^1da177e4 Linus Torvalds 2005-04-16 598 struct sk_buff *frag; > adf30907d Eric Dumazet 2009-06-02 599 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); > f60e5990d hannes@stressinduktion.org 2015-04-01 600 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? > f60e5990d hannes@stressinduktion.org 2015-04-01 601 inet6_sk(skb->sk) : NULL; > ^1da177e4 Linus Torvalds 2005-04-16 602 struct ipv6hdr *tmp_hdr; > ^1da177e4 Linus Torvalds 2005-04-16 603 struct frag_hdr *fh; > 7f25fe5b3 Junwei Hu 2019-04-02 604 unsigned int mtu, hlen, left, len, nexthdr_offset; > a7ae19922 Herbert Xu 2011-11-18 605 int hroom, troom; > 286c2349f Martin KaFai Lau 2015-05-22 606 __be32 frag_id; > ^1da177e4 Linus Torvalds 2005-04-16 607 int ptr, offset = 0, err = 0; > ^1da177e4 Linus Torvalds 2005-04-16 608 u8 *prevhdr, nexthdr = 0; > ^^^^^^^^ > 7f25fe5b3 Junwei Hu 2019-04-02 @609 nexthdr_offset = prevhdr - skb_network_header(skb); > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation > > . > Hi Dan, Thank you for your remind, I sorry for this, i send the patch v4 yesterday. You can get it from the mail list.
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