From 0901df3aeaee6cb5dde2fd51089786aff6225ebf Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Thu, 26 Jan 2017 00:42:49 +0100 Subject: [PATCH] bpf: use prefix_len in test_tag when reading fdinfo 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 Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- tools/testing/selftests/bpf/test_tag.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/test_tag.c b/tools/testing/selftests/bpf/test_tag.c index 6ab4793b3d16..5f7c602f47d1 100644 --- a/tools/testing/selftests/bpf/test_tag.c +++ b/tools/testing/selftests/bpf/test_tag.c @@ -99,7 +99,7 @@ static void tag_from_fdinfo(int fd_prog, uint8_t *tag, uint32_t len) assert(fp); while (fgets(buff, sizeof(buff), fp)) { - if (strncmp(buff, "prog_tag:\t", len)) + if (strncmp(buff, "prog_tag:\t", prefix_len)) continue; ret = hex2bin(tag, buff + prefix_len, len); break; -- 2.20.1