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Incorporate vendor commit ecdc5c0a7f7591a7cd4a:

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In userland, sign extend the offset for JA instructions.

We currently use that to implement "ip6 protochain", and "pc" might be
wider than "pc->k", in which case we need to arrange that "pc->k" be
sign-extended, by casting it to bpf_int32.

PR:		kern/157188
Submitted by:	plosher
MFC after:	2 weeks
This commit is contained in:
Xin LI 2011-06-28 00:58:12 +00:00
parent 7d12b6e172
commit c62908a982
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=223616
1 changed files with 11 additions and 0 deletions
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11
contrib/libpcap/bpf/net/bpf_filter.c
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@ -405,7 +405,18 @@ bpf_filter(pc, p, wirelen, buflen)
continue;
case BPF_JMP|BPF_JA:
#if defined(KERNEL) || defined(_KERNEL)
/*
* No backward jumps allowed.
*/
pc += pc->k;
#else
/*
* XXX - we currently implement "ip6 protochain"
* with backward jumps, so sign-extend pc->k.
*/
pc += (bpf_int32)pc->k;
#endif
continue;
case BPF_JMP|BPF_JGT|BPF_K: