[PATCH AUTOSEL 4.19 51/56] reiserfs: Fix memory leak in reiserfs_parse_options()

[Sasha Levin]

From: Jan Kara <jack@xxxxxxx>

[ Upstream commit e9d4709fcc26353df12070566970f080e651f0c9 ]

When a usrjquota or grpjquota mount option is used multiple times, we
will leak memory allocated for the file name. Make sure the last setting
is used and all the previous ones are properly freed.

Reported-by: syzbot+c9e294bbe0333a6b7640@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/reiserfs/super.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index de5eda33c92a0..ec5716dd58c23 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1264,6 +1264,10 @@ static int reiserfs_parse_options(struct super_block *s,
 						 "turned on.");
 				return 0;
 			}
+			if (qf_names[qtype] !=
+			    REISERFS_SB(s)->s_qf_names[qtype])
+				kfree(qf_names[qtype]);
+			qf_names[qtype] = NULL;
 			if (*arg) {	/* Some filename specified? */
 				if (REISERFS_SB(s)->s_qf_names[qtype]
 				    && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
@@ -1293,10 +1297,6 @@ static int reiserfs_parse_options(struct super_block *s,
 				else
 					*mount_options |= 1 << REISERFS_GRPQUOTA;
 			} else {
-				if (qf_names[qtype] !=
-				    REISERFS_SB(s)->s_qf_names[qtype])
-					kfree(qf_names[qtype]);
-				qf_names[qtype] = NULL;
 				if (qtype == USRQUOTA)
 					*mount_options &= ~(1 << REISERFS_USRQUOTA);
 				else
-- 
2.25.1