This is a note to let you know that I've just added the patch titled
ext4: fix leaking sysfs kobject after failed mount
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-leaking-sysfs-kobject-after-failed-mount.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cb8d53d2c97369029cc638c9274ac7be0a316c75 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Tue, 22 Sep 2020 09:24:56 -0700
Subject: ext4: fix leaking sysfs kobject after failed mount
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit cb8d53d2c97369029cc638c9274ac7be0a316c75 upstream.
ext4_unregister_sysfs() only deletes the kobject. The reference to it
needs to be put separately, like ext4_put_super() does.
This addresses the syzbot report
"memory leak in kobject_set_name_vargs (3)"
(https://syzkaller.appspot.com/bug?extid=9f864abad79fae7c17e1).
Reported-by: syzbot+9f864abad79fae7c17e1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 72ba74508b28 ("ext4: release sysfs kobject when failing to enable quotas on mount")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200922162456.93657-1-ebiggers@xxxxxxxxxx
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/super.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4336,6 +4336,7 @@ cantfind_ext4:
#ifdef CONFIG_QUOTA
failed_mount8:
ext4_unregister_sysfs(sb);
+ kobject_put(&sbi->s_kobj);
#endif
failed_mount7:
ext4_unregister_li_request(sb);
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-4.9/ext4-fix-leaking-sysfs-kobject-after-failed-mount.patch
