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| author | jkim <jkim@FreeBSD.org> | 2006-01-03 20:26:03 +0000 |
|---|---|---|
| committer | jkim <jkim@FreeBSD.org> | 2006-01-03 20:26:03 +0000 |
| commit | ae104d9814b199542431e6bc4bd83c1a9efdde8a (patch) | |
| tree | 39c7a2b61e95daae0a092f19a5bc00725b0b46a8 /sys/i386 | |
| parent | d339804fc16b1cfac17acb0d33520ec14d3b90da (diff) | |
| download | FreeBSD-src-ae104d9814b199542431e6bc4bd83c1a9efdde8a.zip FreeBSD-src-ae104d9814b199542431e6bc4bd83c1a9efdde8a.tar.gz | |
- Explicitly validate an empty filter to match bpf_filter() comment[1].
- Do not use BPF JIT compiler for an empty filter.
[1] Pointed out by: darrenr
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/bpf_jit_machdep.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/i386/i386/bpf_jit_machdep.c b/sys/i386/i386/bpf_jit_machdep.c index 1465ce5..362569e 100644 --- a/sys/i386/i386/bpf_jit_machdep.c +++ b/sys/i386/i386/bpf_jit_machdep.c @@ -103,6 +103,10 @@ bpf_jit_compile(struct bpf_insn *prog, u_int nins, int *mem) */ emit_func emitm; + /* Do not compile an empty filter. */ + if (nins == 0) + return NULL; + /* Allocate the reference table for the jumps */ stream.refs = (u_int *)malloc((nins + 1) * sizeof(u_int), M_BPFJIT, M_NOWAIT); |
