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From: Nikolay Borisov <nborisov@suse.com>
To: Al Viro <viro@zeniv.linux.org.uk>, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs: oops in device_list_add()
Date: Sun, 27 Jan 2019 14:59:21 +0200
Message-ID: <9ac3e2ca-72ad-0812-3dff-4a8057ea2b75@suse.com> (raw)
In-Reply-To: <20190127045755.GH2217@ZenIV.linux.org.uk>



On 27.01.19 г. 6:58 ч., Al Viro wrote:
> 	alloc_fs_devices() can return ERR_PTR(-ENOMEM), so
> dereferencing its result before the check for IS_ERR() is
> a bad idea...
> 
> Fixes: d1a63002829a4
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Thought this was already fixed, doh...

Reviewed-by: Nikolay Borisov <nborisov@suse.com>

> ---
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 85149f27644d..72adc5643bde 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -955,11 +955,11 @@ static noinline struct btrfs_device *device_list_add(const char *path,
>  		else
>  			fs_devices = alloc_fs_devices(disk_super->fsid, NULL);
>  
> -		fs_devices->fsid_change = fsid_change_in_progress;
> -
>  		if (IS_ERR(fs_devices))
>  			return ERR_CAST(fs_devices);
>  
> +		fs_devices->fsid_change = fsid_change_in_progress;
> +
>  		mutex_lock(&fs_devices->device_list_mutex);
>  		list_add(&fs_devices->fs_list, &fs_uuids);
>  
> 

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-27  4:58 Al Viro
2019-01-27 12:59 ` Nikolay Borisov [this message]
2019-01-28 11:47 ` Anand Jain
2019-01-28 15:04 ` David Sterba

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