From: Ye Bin There's issue as follows: KASAN: null-ptr-deref in range [0x00000000000002c0-0x00000000000002c7] Tainted: [E]=UNSIGNED_MODULE, [N]=TEST RIP: 0010:extents_kunit_exit+0x2e/0xc0 [ext4_test] Call Trace: kunit_try_run_case_cleanup+0xbc/0x100 [kunit] kunit_generic_run_threadfn_adapter+0x89/0x100 [kunit] kthread+0x408/0x540 ret_from_fork+0xa76/0xdf0 ret_from_fork_asm+0x1a/0x30 Above issue happens as extents_kunit_init() init testcase failed. So test if testcase is inited success. Fixes: cb1e0c1d1fad ("ext4: kunit tests for extent splitting and conversion") Signed-off-by: Ye Bin --- fs/ext4/extents-test.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/ext4/extents-test.c b/fs/ext4/extents-test.c index 543236a31e13..6ae72986ca9c 100644 --- a/fs/ext4/extents-test.c +++ b/fs/ext4/extents-test.c @@ -142,9 +142,12 @@ static struct file_system_type ext_fs_type = { static void extents_kunit_exit(struct kunit *test) { - struct super_block *sb = k_ctx.k_ei->vfs_inode.i_sb; - struct ext4_sb_info *sbi = sb->s_fs_info; + struct ext4_sb_info *sbi; + if (!k_ctx.k_ei) + return; + + sbi = k_ctx.k_ei->vfs_inode.i_sb->s_fs_info; ext4_es_unregister_shrinker(sbi); deactivate_super(sbi->s_sb); kfree(sbi); -- 2.34.1