[tip:perf/core] perf config: Bail out when a handler returns failure for a key-value pair

From: tip-bot for Arnaldo Carvalho de Melo
Date: Mon Jun 17 2019 - 15:23:49 EST

Commit-ID: 22d4621987faf651fee92c532a3eaba9a0e31ba0
Gitweb: https://git.kernel.org/tip/22d4621987faf651fee92c532a3eaba9a0e31ba0
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 6 Jun 2019 10:56:55 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 10 Jun 2019 15:50:01 -0300

perf config: Bail out when a handler returns failure for a key-value pair

So perf_config() uses:

int ret = 0;

perf_config_set__for_each_entry(config_set, section, item) {
ret = fn();
if (ret < 0)

return ret;

Expecting that that break will imediatelly go to function exit to return
that error value (ret).

The problem is that perf_config_set__for_each_entry() expands into two
nested for() loops, one traversing the sections in a config and the
second the items in each of those sections, so we have to change that
'break' to a goto label right before that final 'return ret'.

With that, for instance 'perf trace' now correctly bails out when a
event that is requested to be added via its 'trace.add_events'
~/.perfconfig entry gets rejected by the kernel BPF verifier:

# perf trace ls
event syntax error: '/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o'
\___ Kernel verifier blocks program loading

(add -v to see detail)
Run 'perf list' for a list of valid events
Error: wrong config key-value pair trace.add_events=/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o

While before it would continue and explode later, when trying to find
maps that would have been in place had that augmented_raw_syscalls.o
precompiled BPF proggie been accepted by the, humm, bast... rigorous
kernel BPF verifier 8-)

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Martin KaFai Lau <kafai@xxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: Suzuki Poulouse <suzuki.poulose@xxxxxxx>
Cc: Taeung Song <treeze.taeung@xxxxxxxxx>
Cc: Yonghong Song <yhs@xxxxxx>
Fixes: 8a0a9c7e9146 ("perf config: Introduce new init() and exit()")
Link: https://lkml.kernel.org/n/tip-qvqxfk9d0rn1l7lcntwiezrr@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/util/config.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 7e3c1b60120c..e7d2c08d263a 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -739,11 +739,15 @@ int perf_config(config_fn_t fn, void *data)
if (ret < 0) {
pr_err("Error: wrong config key-value pair %s=%s\n",
key, value);
- break;
+ /*
+ * Can't be just a 'break', as perf_config_set__for_each_entry()
+ * expands to two nested for() loops.
+ */
+ goto out;
return ret;