reiserfs: Fix memory leak in reiserfs_parse_options()

[ 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@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 9caf3948417c0c6e5b073c4da6e005d5eb70ad55..fbae5f4eea09c44c394767fdd8cfcbd4525b7ad3 100644 (file)
--- 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