fs: reiserfs: remove useless new_opts in reiserfs_remount

stable inclusion
from stable-v5.10.166
commit c4097e844a6e1368b7de1fded5713e7c52c07237
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7TH9O

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c4097e844a6e1368b7de1fded5713e7c52c07237

--------------------------------

commit 81dedaf1 upstream.

Since the commit c3d98ea0 ("VFS: Don't use save/replace_mount_options
if not using generic_show_options") eliminates replace_mount_options
in reiserfs_remount, but does not handle the allocated new_opts,
it will cause memory leak in the reiserfs_remount.

Because new_opts is useless in reiserfs_mount, so we fix this bug by
removing the useless new_opts in reiserfs_remount.

Fixes: c3d98ea0 ("VFS: Don't use save/replace_mount_options if not using generic_show_options")
Link: https://lore.kernel.org/r/20211027143445.4156459-1-mudongliangabcd@gmail.comSigned-off-by: NDongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NFedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Nsanglipeng <sanglipeng1@jd.com>

fs/reiserfs/super.c

@@ -1437,7 +1437,6 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	unsigned long safe_mask = 0;
 	unsigned int commit_max_age = (unsigned int)-1;
 	struct reiserfs_journal *journal = SB_JOURNAL(s);
-	char *new_opts;
 	int err;
 	char *qf_names[REISERFS_MAXQUOTAS];
 	unsigned int qfmt = 0;
@@ -1445,10 +1444,6 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	int i;
 #endif
 
-	new_opts = kstrdup(arg, GFP_KERNEL);
-	if (arg && !new_opts)
-		return -ENOMEM;
-
 	sync_filesystem(s);
 	reiserfs_write_lock(s);
 
@@ -1599,7 +1594,6 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 out_err_unlock:
 	reiserfs_write_unlock(s);
 out_err:
-	kfree(new_opts);
 	return err;
 }