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ext4: fix oops in ext4_quota_off()

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If quota is not enabled when ext4_quota_off() is called, we must not
dereference quota file inode since it is NULL.  Check properly for
this.

This fixes a bug in commit 21f976975c (ext4: remove unnecessary
[cm]time update of quota file), which was merged for 2.6.39-rc3.

Reported-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Amir Goldstein 2011-05-16 09:59:13 -04:00 committed by Theodore Ts'o
parent 6976a6f2ac
commit 0b26859027
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/super.c
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@ -4681,6 +4681,9 @@ static int ext4_quota_off(struct super_block *sb, int type)
if (test_opt(sb, DELALLOC))
sync_filesystem(sb);
if (!inode)
goto out;
/* Update modification times of quota files when userspace can
* start looking at them */
handle = ext4_journal_start(inode, 1);