linux-kernel - [PATCH] Bluetooth: selftest: Fix memleak in test

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Message-ID: <20221109085835.213252-1-chenzhongjin@huawei.com>
Date:   Wed, 9 Nov 2022 16:58:35 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <marcel@...tmann.org>, <johan.hedberg@...il.com>,
        <luiz.dentz@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <tudor.ambarus@...rochip.com>, <chenzhongjin@...wei.com>
Subject: [PATCH] Bluetooth: selftest: Fix memleak in test_ecdh()

kmemleak reported:
 Bluetooth: ECDH sample 1 failed
 kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
 unreferenced object 0xffff888102149100 (size 96):
  comm "modprobe", pid 418, jiffies 4295082093 (age 610.644s)
  ...
  backtrace:
    [<00000000c8e4e5a6>] __kmalloc_node+0x4c/0x1c0
    [<000000006cdcfddc>] crypto_create_tfm_node+0x89/0x320
    [<00000000e222ad46>] crypto_alloc_tfm_node+0xfd/0x2f0
    [<00000000871fc045>] 0xffffffffc05c94ab
    [<00000000e889f45e>] 0xffffffffc05c8024
    [<000000001ff0c346>] do_one_initcall+0xd0/0x4e0
  ...

In test_ecdh(), when test sample fails, crypto_free_kpp(tfm) is not
called, which makes tfm memory leaked. Fix it by moving crypto_free_kpp
behind done label.

Fixes: 47eb2ac80918 ("Bluetooth: move ecdh allocation outside of ecdh_helper")
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 net/bluetooth/selftest.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/selftest.c b/net/bluetooth/selftest.c
index f49604d44b87..586125a611dd 100644
--- a/net/bluetooth/selftest.c
+++ b/net/bluetooth/selftest.c
@@ -233,8 +233,6 @@ static int __init test_ecdh(void)
 		goto done;
 	}
 
-	crypto_free_kpp(tfm);
-
 	rettime = ktime_get();
 	delta = ktime_sub(rettime, calltime);
 	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
@@ -248,6 +246,8 @@ static int __init test_ecdh(void)
 	else
 		snprintf(test_ecdh_buffer, sizeof(test_ecdh_buffer), "FAIL\n");
 
+	crypto_free_kpp(tfm);
+
 	debugfs_create_file("selftest_ecdh", 0444, bt_debugfs, NULL,
 			    &test_ecdh_fops);
 
-- 
2.17.1