[PATCH 5.4 162/203] Revert "ubifs: Fix memory leak bug in alloc_ubifs_info() error path"

Greg Kroah-Hartman
2020-01-16T23:27:03Z

From: Richard Weinberger <richard@nod.at>

commit 91cbf01178c37086b32148c53e24b04cb77557cf upstream.

This reverts commit 9163e0184bd7d5f779934d34581843f699ad2ffd.

At the point when ubifs_fill_super() runs, we have already a reference
to the super block. So upon deactivate_locked_super() c will get
free()'ed via ->kill_sb().

Cc: Wenwen Wang <wenwen@cs.uga.edu>
Fixes: 9163e0184bd7 ("ubifs: Fix memory leak bug in alloc_ubifs_info() error path")
Reported-by: https://twitter.com/grsecurity/status/1180609139359277056
Signed-off-by: Richard Weinberger <richard@nod.at>
Tested-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/ubifs/super.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2267,10 +2267,8 @@ static struct dentry *ubifs_mount(struct
}
} else {
err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
- if (err) {
- kfree(c);
+ if (err)
goto out_deact;
- }
/* We do not support atime */
sb->s_flags |= SB_ACTIVE;
if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))