linux-kernel - Re: [PATCH] btrfs: fix error value in btrfs_get

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Message-ID: <4e88eb32-ac7d-f0cb-d089-ec197595bce9@suse.com>
Date:   Mon, 3 Aug 2020 12:39:38 +0300
From:   Nikolay Borisov <nborisov@...e.com>
To:     Pavel Machek <pavel@...x.de>, clm@...com, jbacik@...com,
        dsterba@...e.com, sashal@...nel.org, wqu@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        jungyeon@...ech.edu, stable@...nel.org
Subject: Re: [PATCH] btrfs: fix error value in btrfs_get_extent



On 3.08.20 г. 12:35 ч., Pavel Machek wrote:
> btrfs_get_extent() sets variable ret, but out: error path expect error
> to be in variable err. Fix that.
> 
> Signed-off-by: Pavel Machek (CIP) <pavel@...x.de>

Good catch, this also needs:

Fixes: 6bf9e4bd6a27 ("btrfs: inode: Verify inode mode to avoid NULL
pointer dereference")

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


> 
> ---
> 
> Notice that patch introducing this problem is on its way to 4.19.137-stable.
> 
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 7befb7c12bd3..4aaa01540f89 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -7012,7 +7012,7 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
>  	    found_type == BTRFS_FILE_EXTENT_PREALLOC) {
>  		/* Only regular file could have regular/prealloc extent */
>  		if (!S_ISREG(inode->vfs_inode.i_mode)) {
> -			ret = -EUCLEAN;
> +			err = -EUCLEAN;
>  			btrfs_crit(fs_info,
>  		"regular/prealloc extent found for non-regular inode %llu",
>  				   btrfs_ino(inode));
>