linux-kernel - Re: [PATCH 1/2] vboxsf: Avoid an spurious warning if load_nls

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Message-ID: <95be6ebf-9f45-404c-a643-89dd6ee4efdf@redhat.com>
Date: Wed, 3 Apr 2024 16:10:18 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Christoph Hellwig <hch@...radead.org>, Al Viro <viro@...iv.linux.org.uk>
Cc: linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
 linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] vboxsf: Avoid an spurious warning if load_nls_xxx()
 fails

Hi,

On 11/1/23 11:49 AM, Christophe JAILLET wrote:
> If an load_nls_xxx() function fails a few lines above, the 'sbi->bdi_id' is
> still 0.
> So, in the error handling path, we will call ida_simple_remove(..., 0)
> which is not allocated yet.
> 
> In order to prevent a spurious "ida_free called for id=0 which is not
> allocated." message, tweak the error handling path and add a new label.
> 
> Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Thanks, both patches in this series look good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

I have added both patches to my local vboxsf branch now and I'll send
out a pull-request with this and a couple of other vboxsf fixes
soon.

Regards,

Hans





> ---
>  fs/vboxsf/super.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c
> index 1fb8f4df60cb..9848af78215b 100644
> --- a/fs/vboxsf/super.c
> +++ b/fs/vboxsf/super.c
> @@ -151,7 +151,7 @@ static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
>  		if (!sbi->nls) {
>  			vbg_err("vboxsf: Count not load '%s' nls\n", nls_name);
>  			err = -EINVAL;
> -			goto fail_free;
> +			goto fail_destroy_idr;
>  		}
>  	}
>  
> @@ -224,6 +224,7 @@ static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
>  		ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
>  	if (sbi->nls)
>  		unload_nls(sbi->nls);
> +fail_destroy_idr:
>  	idr_destroy(&sbi->ino_idr);
>  	kfree(sbi);
>  	return err;