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>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/quota_v1.c b/fs/quota_v1.c
index f3841f233069..a6cf9269105c 100644
--- a/fs/quota_v1.c
+++ b/fs/quota_v1.c
@@ -139,6 +139,9 @@ static int v1_read_file_info(struct super_block *sb, int type)
                 goto out;
         }
         ret = 0;
+        /* limits are stored as unsigned 32-bit data */
+        dqopt->info[type].dqi_maxblimit = 0xffffffff;
+        dqopt->info[type].dqi_maxilimit = 0xffffffff;
         dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
         dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
 out: