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bpf: use prefix_len in test_tag when reading fdinfo

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We currently used len instead of prefix_len for the strncmp() in
fdinfo on the prog_tag. It still worked as we matched on the correct
output line also with first 8 instead of 10 chars, but lets fix it
properly to use the intended length.

Fixes: 62b64660262a ("bpf: add prog tag test case to bpf selftests")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-01-26 00:42:49 +01:00 committed by David S. Miller
parent 1541f98cc2
commit 0901df3aea
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/test_tag.c
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@ -99,7 +99,7 @@ static void tag_from_fdinfo(int fd_prog, uint8_t *tag, uint32_t len)
assert(fp); assert(fp);
while (fgets(buff, sizeof(buff), fp)) { while (fgets(buff, sizeof(buff), fp)) {
if (strncmp(buff, "prog_tag:\t", len)) if (strncmp(buff, "prog_tag:\t", prefix_len))
continue; continue;
ret = hex2bin(tag, buff + prefix_len, len); ret = hex2bin(tag, buff + prefix_len, len);
break; break;