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reiserfs: Fix memory leak in reiserfs_parse_options()

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[ 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>
This commit is contained in:
Jan Kara 2020-03-04 14:01:44 +01:00 • committed by Greg Kroah-Hartman
parent 796f0d39dc
commit 7f1fabf39f
1 changed files with 4 additions and 4 deletions

8
fs/reiserfs/super.c
View file

@ -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