From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Wed, 12 Apr 2023 12:50:08 +0000 (-0300)
Subject: perf genelf: Use zfree() to reduce chances of use after free
X-Git-Tag: v6.6.17~4887^2~88
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e413f9f13f6a8a591af0ac39ef50af02b42a0df8;p=platform%2Fkernel%2Flinux-rpi.git

perf genelf: Use zfree() to reduce chances of use after free

Do defensive programming by using zfree() to initialize freed pointers
to NULL, so that eventual use after free result in a NULL pointer deref
instead of more subtle behaviour.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/genelf_debug.c b/tools/perf/util/genelf_debug.c
index 8786c36..aa5dcc5 100644
--- a/tools/perf/util/genelf_debug.c
+++ b/tools/perf/util/genelf_debug.c
@@ -11,6 +11,7 @@
  * @author Philippe Elie
  */
 #include <linux/compiler.h>
+#include <linux/zalloc.h>
 #include <sys/types.h>
 #include <stdio.h>
 #include <getopt.h>
@@ -90,7 +91,7 @@ buffer_ext_init(struct buffer_ext *be)
 static void
 buffer_ext_exit(struct buffer_ext *be)
 {
-	free(be->data);
+	zfree(&be->data);
 }
 
 static inline size_t