From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Wed, 12 Apr 2023 12:50:08 +0000 (-0300)
Subject: perf env: Use zfree() to reduce chances of use after free
X-Git-Tag: v6.6.7~2868^2~95
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9fbde6c8002bce61acd0c2187cc41c43a7c99968;p=platform%2Fkernel%2Flinux-starfive.git

perf env: 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/env.c b/tools/perf/util/env.c
index 5b8cf6a..ebf2e80 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -149,7 +149,7 @@ static void perf_env__purge_bpf(struct perf_env *env)
 		node = rb_entry(next, struct bpf_prog_info_node, rb_node);
 		next = rb_next(&node->rb_node);
 		rb_erase(&node->rb_node, root);
-		free(node->info_linear);
+		zfree(&node->info_linear);
 		free(node);
 	}