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ext4: fix memory leak in ext4_fill_super

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commit 618f003199c6188e01472b03cdbba227f1dc5f24 upstream.

static int kthread(void *_create) will return -ENOMEM
or -EINTR in case of internal failure or
kthread_stop() call happens before threadfn call.

To prevent fancy error checking and make code
more straightforward we moved all cleanup code out
of kmmpd threadfn.

Also, dropped struct mmpd_data at all. Now struct super_block
is a threadfn data and struct buffer_head embedded into
struct ext4_sb_info.

Reported-by: syzbot+d9e482e303930fa4f6ff@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210430185046.15742-1-paskripkin@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Skripkin
2021-04-30 21:50:46 +03:00
committed by Greg Kroah-Hartman
parent 3780348c1a
commit 5e4f5138bd
3 changed files with 21 additions and 21 deletions
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4
fs/ext4/ext4.h
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@@ -1480,6 +1480,7 @@ struct ext4_sb_info {
struct kobject s_kobj;
struct completion s_kobj_unregister;
struct super_block *s_sb;
struct buffer_head *s_mmp_bh;
/* Journaling */
struct journal_s *s_journal;
@@ -3624,6 +3625,9 @@ extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
/* mmp.c */
extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
/* mmp.c */
extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
/* verity.c */
extern const struct fsverity_operations ext4_verityops;