ext4: unregister sysfs path before destroying jbd2 journal

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Call ext4_unregister_sysfs(), before destroying jbd2 journal,
since below might cause, NULL pointer dereference issue.
This got reported with LTP tests.

ext4_put_super() 		cat /sys/fs/ext4/loop2/journal_task
	| 				ext4_attr_show();
ext4_jbd2_journal_destroy();  			|
    	|				 journal_task_show()
	| 					|
	| 				task_pid_vnr(NULL);
sbi->s_journal = NULL;

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200318061301.4320-1-riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

...

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Ritesh Harjani 2020-03-18 11:43:01 +05:30 • committed by Theodore Ts'o

parent f1eec3b0d0

commit 5e47868fb9

1 changed files with 7 additions and 1 deletions

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fs/ext4/super.c

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