bpf: use prefix_len in test_tag when reading fdinfo
authorDaniel Borkmann <daniel@iogearbox.net>
Wed, 25 Jan 2017 23:42:49 +0000 (00:42 +0100)
committerDavid S. Miller <davem@davemloft.net>
Thu, 26 Jan 2017 04:15:28 +0000 (23:15 -0500)
commit0901df3aeaee6cb5dde2fd51089786aff6225ebf
treed55161ddc68c74ec75faa8bfd219a6e593a14c17
parent1541f98cc252fac55d4e7cc933deddf341ff1710
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 <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
tools/testing/selftests/bpf/test_tag.c