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authorJan Kara <jack@suse.cz>2016-03-29 18:20:10 +0300
committerJan Kara <jack@suse.cz>2016-03-29 18:20:10 +0300
commit17e8a8936c3f28085a858e65baee90dff5e8d48b (patch)
tree6ad1c88a92c84e90bf23c719d467eb198412e1a1 /fs/quota
parent1993b176a8224e371e0732ffada7ab9eb3b0912b (diff)
downloadlinux-17e8a8936c3f28085a858e65baee90dff5e8d48b.tar.xz
quota: Handle Q_GETNEXTQUOTA when quota is disabled
Currently we oopsed when Q_GETNEXTQUOTA got called when quota was disabled. Properly check whether quota is enabled for the filesystem before calling into quota format handler. Reported-by: Ted Tso <tytso@mit.edu> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/quota')
-rw-r--r--fs/quota/dquot.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index ba827daea5a0..ff21980d0119 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2047,11 +2047,20 @@ int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
struct quota_info *dqopt = sb_dqopt(sb);
int err;
- if (!dqopt->ops[qid->type]->get_next_id)
- return -ENOSYS;
+ mutex_lock(&dqopt->dqonoff_mutex);
+ if (!sb_has_quota_active(sb, qid->type)) {
+ err = -ESRCH;
+ goto out;
+ }
+ if (!dqopt->ops[qid->type]->get_next_id) {
+ err = -ENOSYS;
+ goto out;
+ }
mutex_lock(&dqopt->dqio_mutex);
err = dqopt->ops[qid->type]->get_next_id(sb, qid);
mutex_unlock(&dqopt->dqio_mutex);
+out:
+ mutex_unlock(&dqopt->dqonoff_mutex);
return err;
}