linux-kernel - [PATCH bpf-next] selftests/bpf: fix prog_tests/uprobe

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Date:   Thu, 21 Apr 2022 15:23:17 +0200
From:   Artem Savkov <asavkov@...hat.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Artem Savkov <asavkov@...hat.com>
Subject: [PATCH bpf-next] selftests/bpf: fix prog_tests/uprobe_autoattach compilation error

I am getting the following compilation error for prog_tests/uprobe_autoattach.c

tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c: In function ‘test_uprobe_autoattach’:
./test_progs.h:209:26: error: pointer ‘mem’ may be used after ‘free’ [-Werror=use-after-free]

mem variable is now used in one of the asserts so it shouldn't be freed right
away. Move free(mem) after the assert block.

Fixes: 1717e248014c ("selftests/bpf: Uprobe tests should verify param/return values")
Signed-off-by: Artem Savkov <asavkov@...hat.com>
---
 tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
index d6003dc8cc99..35b87c7ba5be 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
@@ -34,7 +34,6 @@ void test_uprobe_autoattach(void)
 
 	/* trigger & validate shared library u[ret]probes attached by name */
 	mem = malloc(malloc_sz);
-	free(mem);
 
 	ASSERT_EQ(skel->bss->uprobe_byname_parm1, trigger_val, "check_uprobe_byname_parm1");
 	ASSERT_EQ(skel->bss->uprobe_byname_ran, 1, "check_uprobe_byname_ran");
@@ -44,6 +43,8 @@ void test_uprobe_autoattach(void)
 	ASSERT_EQ(skel->bss->uprobe_byname2_ran, 3, "check_uprobe_byname2_ran");
 	ASSERT_EQ(skel->bss->uretprobe_byname2_rc, mem, "check_uretprobe_byname2_rc");
 	ASSERT_EQ(skel->bss->uretprobe_byname2_ran, 4, "check_uretprobe_byname2_ran");
+
+	free(mem);
 cleanup:
 	test_uprobe_autoattach__destroy(skel);
 }
-- 
2.35.1