linux-kernel - [PATCH RESEND 2/2] mm/damon/core-test: Fix memory leak in damon_new

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Message-ID: <20230918051044.3814018-3-ruanjinjie@huawei.com>
Date:   Mon, 18 Sep 2023 13:10:44 +0800
From:   Jinjie Ruan <ruanjinjie@...wei.com>
To:     <sj@...nel.org>, <akpm@...ux-foundation.org>,
        <brendan.higgins@...ux.dev>, <feng.tang@...el.com>,
        <damon@...ts.linux.dev>, <linux-mm@...ck.org>,
        <kunit-dev@...glegroups.com>, <linux-kselftest@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH RESEND 2/2] mm/damon/core-test: Fix memory leak in damon_new_ctx()

The damon_ctx which is allocated by kzalloc() in damon_new_ctx() in
damon_test_ops_registration() and damon_test_set_attrs() are not freed and
it causes below memory leak. So use damon_destroy_ctx() to free it.

unreferenced object 0xffff2b49c6968800 (size 512):
  comm "kunit_try_catch", pid 350, jiffies 4294895294 (age 557.028s)
  hex dump (first 32 bytes):
    88 13 00 00 00 00 00 00 a0 86 01 00 00 00 00 00  ................
    00 87 93 03 00 00 00 00 0a 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368
    [<0000000073acab3b>] __kmem_cache_alloc_node+0x174/0x290
    [<00000000b5f89cef>] kmalloc_trace+0x40/0x164
    [<00000000eb19e83f>] damon_new_ctx+0x28/0xb4
    [<00000000daf6227b>] damon_test_ops_registration+0x34/0x328
    [<00000000559c4801>] kunit_try_run_case+0x50/0xac
    [<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c
    [<000000003c3e9211>] kthread+0x124/0x130
    [<0000000028f85bdd>] ret_from_fork+0x10/0x20
unreferenced object 0xffff2b49c1a9cc00 (size 512):
  comm "kunit_try_catch", pid 356, jiffies 4294895306 (age 557.000s)
  hex dump (first 32 bytes):
    88 13 00 00 00 00 00 00 a0 86 01 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 0a 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000088e71769>] slab_post_alloc_hook+0xb8/0x368
    [<0000000073acab3b>] __kmem_cache_alloc_node+0x174/0x290
    [<00000000b5f89cef>] kmalloc_trace+0x40/0x164
    [<00000000eb19e83f>] damon_new_ctx+0x28/0xb4
    [<00000000058495c4>] damon_test_set_attrs+0x30/0x1a8
    [<00000000559c4801>] kunit_try_run_case+0x50/0xac
    [<000000003932ed49>] kunit_generic_run_threadfn_adapter+0x20/0x2c
    [<000000003c3e9211>] kthread+0x124/0x130
    [<0000000028f85bdd>] ret_from_fork+0x10/0x20

Fixes: d1836a3b2a9a ("mm/damon/core-test: initialise context before test in damon_test_set_attrs()")
Fixes: 4f540f5ab4f2 ("mm/damon/core-test: add a kunit test case for ops registration")
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 mm/damon/core-test.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 255f8c925c00..ce86ed30fb47 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -266,6 +266,8 @@ static void damon_test_ops_registration(struct kunit *test)
 
 	/* Check double-registration failure again */
 	KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), -EINVAL);
+
+	damon_destroy_ctx(c);
 }
 
 static void damon_test_set_regions(struct kunit *test)
@@ -342,6 +344,8 @@ static void damon_test_set_attrs(struct kunit *test)
 	invalid_attrs = valid_attrs;
 	invalid_attrs.aggr_interval = 4999;
 	KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &invalid_attrs), -EINVAL);
+
+	damon_destroy_ctx(c);
 }
 
 static void damos_test_new_filter(struct kunit *test)
-- 
2.34.1