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| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-05-25 14:08:03 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-27 00:24:10 -0400 |
| commit | 082739aa458a74add9a2362988e5aca0367bfa53 (patch) | |
| tree | 7c24faf20b3215347b95b569437261c51b36ae46 /tools/net | |
| parent | b48732e4a48d80ed4a14812f0bab09560846514e (diff) | |
| download | lwn-082739aa458a74add9a2362988e5aca0367bfa53.tar.gz lwn-082739aa458a74add9a2362988e5aca0367bfa53.zip | |
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>
Diffstat (limited to 'tools/net')
| -rw-r--r-- | tools/net/bpf_jit_disasm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/net/bpf_jit_disasm.c b/tools/net/bpf_jit_disasm.c index c5baf9c591b7..618c2bcd4eab 100644 --- a/tools/net/bpf_jit_disasm.c +++ b/tools/net/bpf_jit_disasm.c @@ -123,6 +123,8 @@ static int get_last_jit_image(char *haystack, size_t hlen, assert(ret == 0); ptr = haystack; + memset(pmatch, 0, sizeof(pmatch)); + while (1) { ret = regexec(®ex, ptr, 1, pmatch, 0); if (ret == 0) { |