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xfs: don't crash on corrupt /quotas dirent

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If the /quotas dirent points to an inode but the inode isn't loadable
(and hence mkdir returns -EEXIST), don't crash, just bail out.

Cc: <stable@vger.kernel.org> # v6.13-rc1
Fixes: e80fbe1ad8 ("xfs: use metadir for quota inodes")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-12-02 10:57:41 -08:00
parent 3853b5e1d7
commit e57e083be9
1 changed files with 7 additions and 0 deletions
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7
fs/xfs/xfs_qm.c
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@ -731,6 +731,13 @@ xfs_qm_create_metadir_qinos(
error = xfs_dqinode_mkdir_parent(mp, &qi->qi_dirip);
if (error && error != -EEXIST)
return error;
/*
* If the /quotas dirent points to an inode that isn't
* loadable, qi_dirip will be NULL but mkdir_parent will return
* -EEXIST. In this case the metadir is corrupt, so bail out.
*/
if (XFS_IS_CORRUPT(mp, qi->qi_dirip == NULL))
return -EFSCORRUPTED;
}
if (XFS_IS_UQUOTA_ON(mp) && !qi->qi_uquotaip) {