linux-kernel - [PATCH] ext4: Fix potential null dereference in ext4 kunit test

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20250110092421.35619-1-hanchunchao@inspur.com>
Date: Fri, 10 Jan 2025 17:24:21 +0800
From: Charles Han <hanchunchao@...pur.com>
To: <tytso@....edu>, <adilger.kernel@...ger.ca>, <shikemeng@...weicloud.com>
CC: <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Charles Han
	<hanchunchao@...pur.com>
Subject: [PATCH] ext4: Fix potential null dereference in ext4 kunit test

kunit_kzalloc() may return a NULL pointer, dereferencing it
without NULL check may lead to NULL dereference.
Add a NULL check for grp.

Fixes: ac96b56a2fbd ("ext4: Add unit test for mb_mark_used")
Fixes: b7098e1fa7bc ("ext4: Add unit test for mb_free_blocks")
Signed-off-by: Charles Han <hanchunchao@...pur.com>
---
 fs/ext4/mballoc-test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext4/mballoc-test.c b/fs/ext4/mballoc-test.c
index bb2a223b207c..d634c12f1984 100644
--- a/fs/ext4/mballoc-test.c
+++ b/fs/ext4/mballoc-test.c
@@ -796,6 +796,7 @@ static void test_mb_mark_used(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buddy);
 	grp = kunit_kzalloc(test, offsetof(struct ext4_group_info,
 				bb_counters[MB_NUM_ORDERS(sb)]), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, grp);
 
 	ret = ext4_mb_load_buddy(sb, TEST_GOAL_GROUP, &e4b);
 	KUNIT_ASSERT_EQ(test, ret, 0);
@@ -860,6 +861,7 @@ static void test_mb_free_blocks(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buddy);
 	grp = kunit_kzalloc(test, offsetof(struct ext4_group_info,
 				bb_counters[MB_NUM_ORDERS(sb)]), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, grp);
 
 	ret = ext4_mb_load_buddy(sb, TEST_GOAL_GROUP, &e4b);
 	KUNIT_ASSERT_EQ(test, ret, 0);
-- 
2.45.2