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tools: bpf_jit_disasm: fix segfault on disabled debugging log output
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>
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@ -123,6 +123,8 @@ static int get_last_jit_image(char *haystack, size_t hlen,
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assert(ret == 0);
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ptr = haystack;
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memset(pmatch, 0, sizeof(pmatch));
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while (1) {
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ret = regexec(®ex, ptr, 1, pmatch, 0);
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if (ret == 0) {
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