[PATCH 4/6] perf, tool: Properly free format data

[Jiri Olsa <jolsa@redhat.com>]

Format data are allocated during PMU lookup. If the lookup
fails in next steps, we don't release the format data.

This patch ensures that format data get released in case
there's failure during PMU load.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
 tools/perf/util/pmu.c |   58 ++++++++++++++++++++++++++++++-------------------
 1 file changed, 36 insertions(+), 22 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 3c86022..e8cff3d 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -15,6 +15,14 @@ extern FILE *perf_pmu_in;
 
 static LIST_HEAD(pmus);
 
+static void pmu_format_release(struct list_head *head)
+{
+	struct perf_pmu__format *format, *h;
+
+	list_for_each_entry_safe(format, h, head, list)
+		free(format);
+}
+
 /*
  * Parse & process all the sysfs attributes located under
  * the directory specified in 'dir' parameter.
@@ -229,32 +237,38 @@ static struct perf_pmu *pmu_lookup(char *name)
 	LIST_HEAD(aliases);
 	__u32 type;
 
-	/*
-	 * The pmu data we store & need consists of the pmu
-	 * type value and format definitions. Load both right
-	 * now.
-	 */
-	if (pmu_format(name, &format))
-		return NULL;
+	do {
+		/*
+		* The pmu data we store & need consists of the pmu
+		* type value, format and events definitions. Load
+		* all of them right now.
+		*/
+		if (pmu_format(name, &format))
+			break;
 
-	if (pmu_aliases(name, &aliases))
-		return NULL;
+		if (pmu_aliases(name, &aliases))
+			break;
 
-	if (pmu_type(name, &type))
-		return NULL;
+		if (pmu_type(name, &type))
+			break;
 
-	pmu = zalloc(sizeof(*pmu));
-	if (!pmu)
-		return NULL;
+		pmu = zalloc(sizeof(*pmu));
+		if (!pmu)
+			break;
 
-	INIT_LIST_HEAD(&pmu->format);
-	INIT_LIST_HEAD(&pmu->aliases);
-	list_splice(&format, &pmu->format);
-	list_splice(&aliases, &pmu->aliases);
-	pmu->name = strdup(name);
-	pmu->type = type;
-	list_add_tail(&pmu->list, &pmus);
-	return pmu;
+		INIT_LIST_HEAD(&pmu->format);
+		INIT_LIST_HEAD(&pmu->aliases);
+		list_splice(&format, &pmu->format);
+		list_splice(&aliases, &pmu->aliases);
+		pmu->name = strdup(name);
+		pmu->type = type;
+		list_add_tail(&pmu->list, &pmus);
+		return pmu;
+
+	} while (0);
+
+	pmu_format_release(&format);
+	return NULL;
 }
 
 static struct perf_pmu *pmu_find(char *name)
-- 
1.7.10.4