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Message-ID: <tip-f0f702655b09cfe07bcbc1027be67c3fd2a7387b@git.kernel.org>
Date: Fri, 12 Apr 2019 09:37:21 -0700
From: "tip-bot for Gustavo A. R. Silva" <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: songliubraving@...com, hpa@...or.com,
alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
acme@...hat.com, tglx@...utronix.de, gustavo@...eddedor.com,
jolsa@...hat.com, peterz@...radead.org, mingo@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf header: Fix lock/unlock imbalances when
processing BPF/BTF info
Commit-ID: f0f702655b09cfe07bcbc1027be67c3fd2a7387b
Gitweb: https://git.kernel.org/tip/f0f702655b09cfe07bcbc1027be67c3fd2a7387b
Author: Gustavo A. R. Silva <gustavo@...eddedor.com>
AuthorDate: Mon, 8 Apr 2019 12:33:55 -0500
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 8 Apr 2019 16:58:07 -0300
perf header: Fix lock/unlock imbalances when processing BPF/BTF info
Fix lock/unlock imbalances by refactoring the code a bit and adding
calls to up_write() before return.
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Acked-by: Song Liu <songliubraving@...com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Addresses-Coverity-ID: 1444315 ("Missing unlock")
Addresses-Coverity-ID: 1444316 ("Missing unlock")
Fixes: a70a1123174a ("perf bpf: Save BTF information as headers to perf.data")
Fixes: 606f972b1361 ("perf bpf: Save bpf_prog_info information as headers to perf.data")
Link: http://lkml.kernel.org/r/20190408173355.GA10501@embeddedor
[ Simplified the exit path to have just one up_write() + return ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/header.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index b9e693825873..2d2af2ac2b1e 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2606,6 +2606,7 @@ static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
perf_env__insert_bpf_prog_info(env, info_node);
}
+ up_write(&env->bpf_progs.lock);
return 0;
out:
free(info_linear);
@@ -2623,7 +2624,9 @@ static int process_bpf_prog_info(struct feat_fd *ff __maybe_unused, void *data _
static int process_bpf_btf(struct feat_fd *ff, void *data __maybe_unused)
{
struct perf_env *env = &ff->ph->env;
+ struct btf_node *node = NULL;
u32 count, i;
+ int err = -1;
if (ff->ph->needs_swap) {
pr_warning("interpreting btf from systems with endianity is not yet supported\n");
@@ -2636,31 +2639,32 @@ static int process_bpf_btf(struct feat_fd *ff, void *data __maybe_unused)
down_write(&env->bpf_progs.lock);
for (i = 0; i < count; ++i) {
- struct btf_node *node;
u32 id, data_size;
if (do_read_u32(ff, &id))
- return -1;
+ goto out;
if (do_read_u32(ff, &data_size))
- return -1;
+ goto out;
node = malloc(sizeof(struct btf_node) + data_size);
if (!node)
- return -1;
+ goto out;
node->id = id;
node->data_size = data_size;
- if (__do_read(ff, node->data, data_size)) {
- free(node);
- return -1;
- }
+ if (__do_read(ff, node->data, data_size))
+ goto out;
perf_env__insert_btf(env, node);
+ node = NULL;
}
+ err = 0;
+out:
up_write(&env->bpf_progs.lock);
- return 0;
+ free(node);
+ return err;
}
struct feature_ops {
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