Hi Greg, On Tue, Nov 03, 2020 at 04:59:23PM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote: > > The patch below does not apply to the 4.9-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. Here is the backport. This will apply to both v4.9.y and v4.4.y. -- Regards Sudip
>From 4be70a405c3a30c8602ea7a6c58b31f905e34106 Mon Sep 17 00:00:00 2001 From: Eric Biggers <ebiggers@xxxxxxxxxx> Date: Tue, 22 Sep 2020 09:24:56 -0700 Subject: [PATCH] ext4: fix leaking sysfs kobject after failed mount 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> --- fs/ext4/super.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 00391db0064b..84d28d3efc60 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4336,6 +4336,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) #ifdef CONFIG_QUOTA failed_mount8: ext4_unregister_sysfs(sb); + kobject_put(&sbi->s_kobj); #endif failed_mount7: ext4_unregister_li_request(sb); -- 2.11.0
