linux-kernel - Re: [PATCH v2] afs: Increase buffer size in afs_update_volume

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Message-ID: <272e2048-85ca-4429-b3dc-b2434318dca4@auristor.com>
Date: Mon, 12 Feb 2024 09:56:41 -0500
From: Jeffrey E Altman <jaltman@...istor.com>
To: Daniil Dulov <d.dulov@...ddin.ru>
Cc: linux-afs@...ts.infradead.org, Marc Dionne <marc.dionne@...istor.com>,
 David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org,
 lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] afs: Increase buffer size in
 afs_update_volume_status()

On 2/12/2024 3:33 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 020ecd45e476..d4a379bfd54e 100644
> --- a/fs/afs/volume.c
> +++ b/fs/afs/volume.c
> @@ -353,7 +353,7 @@ 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[20];
>   	int ret, idsz;
>   
>   	_enter("");

Reviewed-by: Jeffrey Altman <jaltman@...istor.com>