[PATCH 6.19 095/781] selftests/bpf: Fix resource leak in serial_test_wq on attach failure

Greg Kroah-Hartman
2026-02-25T01:28:35Z

From: Kery Qi <qikeyu2017@gmail.com>

[ Upstream commit a32ae2658471dd87a2f7a438388ed7d9a5767212 ]

When wq__attach() fails, serial_test_wq() returns early without calling
wq__destroy(), leaking the skeleton resources allocated by
wq__open_and_load(). This causes ASAN leak reports in selftests runs.

Fix this by jumping to a common clean_up label that calls wq__destroy()
on all exit paths after successful open_and_load.

Note that the early return after wq__open_and_load() failure is correct
and doesn't need fixing, since that function returns NULL on failure
(after internally cleaning up any partial allocations).

Fixes: 8290dba51910 ("selftests/bpf: wq: add bpf_wq_start() checks")
Signed-off-by: Kery Qi <qikeyu2017@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20260121094114.1801-3-qikeyu2017@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/bpf/prog_tests/wq.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/wq.c b/tools/testing/selftests/bpf/prog_tests/wq.c
index 15c67d23128b2..84831eecc935b 100644
--- a/tools/testing/selftests/bpf/prog_tests/wq.c
+++ b/tools/testing/selftests/bpf/prog_tests/wq.c
@@ -16,12 +16,12 @@ void serial_test_wq(void)
/* re-run the success test to check if the timer was actually executed */

wq_skel = wq__open_and_load();
- if (!ASSERT_OK_PTR(wq_skel, "wq_skel_load"))
+ if (!ASSERT_OK_PTR(wq_skel, "wq__open_and_load"))
return;

err = wq__attach(wq_skel);
if (!ASSERT_OK(err, "wq_attach"))
- return;
+ goto clean_up;

prog_fd = bpf_program__fd(wq_skel->progs.test_syscall_array_sleepable);
err = bpf_prog_test_run_opts(prog_fd, &topts);
@@ -31,6 +31,7 @@ void serial_test_wq(void)
usleep(50); /* 10 usecs should be enough, but give it extra */

ASSERT_EQ(wq_skel->bss->ok_sleepable, (1 << 1), "ok_sleepable");
+clean_up:
wq__destroy(wq_skel);
}

--
2.51.0