linux-kernel - Re: [PATCH 12/12 linux-next] udf: check partition reference in udf_read

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Date:   Tue, 10 Jan 2017 11:59:37 +0100
From:   Jan Kara <jack@...e.cz>
To:     Fabian Frederick <fabf@...net.be>
Cc:     Jan Kara <jack@...e.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 12/12 linux-next] udf: check partition reference in
 udf_read_inode()

On Fri 06-01-17 21:54:43, Fabian Frederick wrote:
> We were checking block number without checking partition.
> sbi->s_partmaps[iloc->partitionReferenceNum] could lead to
> bad memory access. See udf_nfs_get_inode() path for instance.
> 
> Signed-off-by: Fabian Frederick <fabf@...net.be>

Thanks. Applied.

								Honza

> ---
>  fs/udf/inode.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/udf/inode.c b/fs/udf/inode.c
> index 47638eb..3926973 100644
> --- a/fs/udf/inode.c
> +++ b/fs/udf/inode.c
> @@ -1276,6 +1276,12 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
>  	int ret = -EIO;
>  
>  reread:
> +	if (iloc->partitionReferenceNum >= sbi->s_partitions) {
> +		udf_debug("partition reference: %d > logical volume partitions: %d\n",
> +			  iloc->partitionReferenceNum, sbi->s_partitions);
> +		return -EIO;
> +	}
> +
>  	if (iloc->logicalBlockNum >=
>  	    sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
>  		udf_debug("block=%d, partition=%d out of range\n",
> -- 
> 2.7.4
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR