linux-kernel - RE: [PATCH] afs: Increase buffer size in afs_update_volume

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Date: Mon, 12 Feb 2024 07:38:36 +0000
From: Daniil Dulov <D.Dulov@...ddin.ru>
To: Jeffrey E Altman <jaltman@...istor.com>, "linux-afs@...ts.infradead.org"
	<linux-afs@...ts.infradead.org>
CC: Marc Dionne <marc.dionne@...istor.com>, David Howells
	<dhowells@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "lvc-project@...uxtesting.org"
	<lvc-project@...uxtesting.org>
Subject: RE: [PATCH] afs: Increase buffer size in afs_update_volume_status()

Hello!

Thank you for the review. Yes, idbuf[] shoulf be 20 instead of 19. I'll send the correct patch in a minute.

Daniil Dulov


-----Original Message-----
From: Jeffrey E Altman [mailto:jaltman@...istor.com] 
Sent: Sunday, February 11, 2024 8:24 PM
To: Daniil Dulov <D.Dulov@...ddin.ru>; linux-afs@...ts.infradead.org
Cc: Marc Dionne <marc.dionne@...istor.com>; David Howells <dhowells@...hat.com>; linux-kernel@...r.kernel.org; lvc-project@...uxtesting.org
Subject: Re: [PATCH] afs: Increase buffer size in afs_update_volume_status()

On 2/11/2024 10:04 AM, Daniil Dulov wrote:
> The max length of volume->vid value is 20 characters.
> So increase idbuf[] size up to 20 to avoid overflow.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching 
> and fileserver rotation")
> Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>
> ---
>   fs/afs/volume.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/afs/volume.c b/fs/afs/volume.c index 
> f84194b791d3..9d0da38bbcf6 100644
> --- a/fs/afs/volume.c
> +++ b/fs/afs/volume.c
> @@ -302,7 +302,7 @@ static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
>   {
>   	struct afs_server_list *new, *old, *discard;
>   	struct afs_vldb_entry *vldb;
> -	char idbuf[16];
> +	char idbuf[19];
>   	int ret, idsz;
>   
>   	_enter("");

Thanks for the patch.

The commit message says idbuf[] is being increased to 20 chars but the patch only increases it to 19.

Should idbuf[] be 20 or should the commit message be altered?

Jeffrey Altman