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tools: bpf_jit_disasm: fix segfault on disabled debugging log output

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With recent debugging, I noticed that bpf_jit_disasm segfaults when
there's no debugging output from the JIT compiler to the kernel log.

Reason is that when regexec(3) doesn't match on anything, start/end
offsets are not being filled out and contain some uninitialized garbage
from stack. Thus, we need zero out offsets first.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-05-25 14:08:03 +02:00 committed by David S. Miller
parent b48732e4a4
commit 082739aa45
1 changed files with 2 additions and 0 deletions
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tools/net/bpf_jit_disasm.c
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@ -123,6 +123,8 @@ static int get_last_jit_image(char *haystack, size_t hlen,
assert(ret == 0); assert(ret == 0);
ptr = haystack; ptr = haystack;
memset(pmatch, 0, sizeof(pmatch));
while (1) { while (1) {
ret = regexec(&regex, ptr, 1, pmatch, 0); ret = regexec(&regex, ptr, 1, pmatch, 0);
if (ret == 0) { if (ret == 0) {