perf bpf: Fix two memory leakages when calling perf_env__insert_bpf_prog_info()

If perf_env__insert_bpf_prog_info() returns false due to a duplicate bpf
prog info node insertion, the temporary info_node and info_linear memory
will leak. Add a check to ensure the memory is freed if the function
returns false.

Fixes: d56354dc49091e33 ("perf tools: Save bpf_prog_info and BTF of new BPF programs")
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Zhongqiu Han <quic_zhonhan@quicinc.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20241205084500.823660-4-quic_zhonhan@quicinc.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 15 insertions, 5 deletions

diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 13608237c50e..c81444059ad0 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -289,7 +289,10 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
 		}
 
 		info_node->info_linear = info_linear;
-		perf_env__insert_bpf_prog_info(env, info_node);
+		if (!perf_env__insert_bpf_prog_info(env, info_node)) {
+			free(info_linear);
+			free(info_node);
+		}
 		info_linear = NULL;
 
 		/*
@@ -480,7 +483,10 @@ static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
 	info_node = malloc(sizeof(struct bpf_prog_info_node));
 	if (info_node) {
 		info_node->info_linear = info_linear;
-		perf_env__insert_bpf_prog_info(env, info_node);
+		if (!perf_env__insert_bpf_prog_info(env, info_node)) {
+			free(info_linear);
+			free(info_node);
+		}
 	} else
 		free(info_linear);
 
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 2c5285718465..919fe6f20593 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -24,12 +24,16 @@ struct perf_env perf_env;
 #include "bpf-utils.h"
 #include <bpf/libbpf.h>
 
-void perf_env__insert_bpf_prog_info(struct perf_env *env,
+bool perf_env__insert_bpf_prog_info(struct perf_env *env,
 				    struct bpf_prog_info_node *info_node)
 {
+	bool ret;
+
 	down_write(&env->bpf_progs.lock);
-	__perf_env__insert_bpf_prog_info(env, info_node);
+	ret = __perf_env__insert_bpf_prog_info(env, info_node);
 	up_write(&env->bpf_progs.lock);
+
+	return ret;
 }
 
 bool __perf_env__insert_bpf_prog_info(struct perf_env *env, struct bpf_prog_info_node *info_node)
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 9db2e5a625ed..da11add761d0 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -178,7 +178,7 @@ int perf_env__nr_cpus_avail(struct perf_env *env);
 void perf_env__init(struct perf_env *env);
 bool __perf_env__insert_bpf_prog_info(struct perf_env *env,
 				      struct bpf_prog_info_node *info_node);
-void perf_env__insert_bpf_prog_info(struct perf_env *env,
+bool perf_env__insert_bpf_prog_info(struct perf_env *env,
 				    struct bpf_prog_info_node *info_node);
 struct bpf_prog_info_node *perf_env__find_bpf_prog_info(struct perf_env *env,
 							__u32 prog_id);