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From: Tetsuo Handa <>
To: Christoph Hellwig <>
Subject: Re: [PATCH] block: genhd: fix double kfree() in __alloc_disk_node()
Date: Mon, 20 Sep 2021 17:02:19 +0900	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 2021/09/20 15:40, Christoph Hellwig wrote:
> I was going to suggest to just move the bd_disk initialization after
> the bd_stats allocations,  but iseems like we currently don't even
> the zero the bdev on allocation.  So I suspect we should do that first
> to avoid nasty surprises.

Hmm? bdev_alloc_inode() zeros the bdev on allocation.
Are you talking about some other function?

static struct inode *bdev_alloc_inode(struct super_block *sb)
	struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL);

	if (!ei)
		return NULL;
	memset(&ei->bdev, 0, sizeof(ei->bdev));
	return &ei->vfs_inode;

  reply	other threads:[~2021-09-20  8:03 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-19 13:35 [syzbot] KASAN: use-after-free Read in bdev_free_inode syzbot
2021-09-19 13:37 ` Tetsuo Handa
2021-09-19 14:44   ` [PATCH] block: genhd: fix double kfree() in __alloc_disk_node() Tetsuo Handa
2021-09-20  6:40     ` Christoph Hellwig
2021-09-20  8:02       ` Tetsuo Handa [this message]
2021-09-20  8:05         ` Christoph Hellwig
2021-09-20  8:31           ` [PATCH v2] " Tetsuo Handa
2021-09-20  8:40             ` Christoph Hellwig
2021-10-09  4:53 ` [syzbot] KASAN: use-after-free Read in bdev_free_inode syzbot

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