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authorDaniel Borkmann <daniel@iogearbox.net>2015-05-25 14:08:03 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-27 00:24:10 -0400
commit082739aa458a74add9a2362988e5aca0367bfa53 (patch)
tree7c24faf20b3215347b95b569437261c51b36ae46 /tools/net
parentb48732e4a48d80ed4a14812f0bab09560846514e (diff)
downloadlinux-082739aa458a74add9a2362988e5aca0367bfa53.tar.bz2
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.c2
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(&regex, ptr, 1, pmatch, 0);
if (ret == 0) {