quota: do not allow setting of quota limits to too high values
We should check whether quota limits set via Q_SETQUOTA are not exceeding
limits which quota format is able to handle.
Signed-off-by: Andrew Perepechko <andrew.perepechko@sun.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/dquot.c b/fs/dquot.c
index 41b9dbd..24eef58 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -1709,10 +1709,19 @@
}
/* Generic routine for setting common part of quota structure */
-static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
+static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
{
struct mem_dqblk *dm = &dquot->dq_dqb;
int check_blim = 0, check_ilim = 0;
+ struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
+
+ if ((di->dqb_valid & QIF_BLIMITS &&
+ (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
+ di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
+ (di->dqb_valid & QIF_ILIMITS &&
+ (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
+ di->dqb_isoftlimit > dqi->dqi_maxilimit)))
+ return -ERANGE;
spin_lock(&dq_data_lock);
if (di->dqb_valid & QIF_SPACE) {
@@ -1744,7 +1753,7 @@
clear_bit(DQ_BLKS_B, &dquot->dq_flags);
}
else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
- dm->dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
+ dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
}
if (check_ilim) {
if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
@@ -1752,7 +1761,7 @@
clear_bit(DQ_INODES_B, &dquot->dq_flags);
}
else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
- dm->dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
+ dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
}
if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
clear_bit(DQ_FAKE_B, &dquot->dq_flags);
@@ -1760,21 +1769,24 @@
set_bit(DQ_FAKE_B, &dquot->dq_flags);
spin_unlock(&dq_data_lock);
mark_dquot_dirty(dquot);
+
+ return 0;
}
int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
{
struct dquot *dquot;
+ int rc;
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
if (!(dquot = dqget(sb, id, type))) {
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return -ESRCH;
}
- do_set_dqblk(dquot, di);
+ rc = do_set_dqblk(dquot, di);
dqput(dquot);
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
- return 0;
+ return rc;
}
/* Generic routine for getting common part of quota file information */