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Clear the filter memory area before using it. Leaving it uninitialized may

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leak previous kernel stack contents through a malicioius BPF filter.

PR:		kern/158880
Submitted by:	Guy Harris
Obtained from:	OpenBSD
MFC after:	1 week
This commit is contained in:
mp 2011-07-14 21:06:22 +00:00
parent 64315b936e
commit f3103cdbe2
1 changed files with 2 additions and 0 deletions
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2
sys/net/bpf_filter.c
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@ -177,6 +177,8 @@ bpf_filter(const struct bpf_insn *pc, u_char *p, u_int wirelen, u_int buflen)
bpf_u_int32 k;
u_int32_t mem[BPF_MEMWORDS];
bzero(mem, sizeof(mem));
if (pc == NULL)
/*
* No filter means accept all.