linux-kernel - Re: [PATCH] ecryptfs: replace BUG

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Message-ID: <20200214173818.GB250165@elm>
Date:   Fri, 14 Feb 2020 11:38:18 -0600
From:   Tyler Hicks <tyhicks@...onical.com>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, ecryptfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ecryptfs: replace BUG_ON with error handling code

On 2019-12-15 11:24:04, Aditya Pakki wrote:
> In crypt_scatterlist, if the crypt_stat argument is not set up
> correctly, we avoid crashing, by returning the error upstream.
> This patch performs the fix.
> 
> Signed-off-by: Aditya Pakki <pakki001@....edu>

Hi Aditya - I wanted to check in to see if you are able to submit a new
revision taking into account the feedback from Markus.

Also, I'm curious if you've been able to hit this BUG_ON() or if you are
just being proactive in cleaning up this function?

Let me know if I can help you prepare a v2 of this patch. Thanks!

Tyler

> ---
>  fs/ecryptfs/crypto.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
> index f91db24bbf3b..a064b408d841 100644
> --- a/fs/ecryptfs/crypto.c
> +++ b/fs/ecryptfs/crypto.c
> @@ -311,8 +311,10 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
>  	struct extent_crypt_result ecr;
>  	int rc = 0;
>  
> -	BUG_ON(!crypt_stat || !crypt_stat->tfm
> -	       || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED));
> +	if (!crypt_stat || !crypt_stat->tfm
> +	       || !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
> +		return -EINVAL;
> +
>  	if (unlikely(ecryptfs_verbosity > 0)) {
>  		ecryptfs_printk(KERN_DEBUG, "Key size [%zd]; key:\n",
>  				crypt_stat->key_size);
> -- 
> 2.20.1
>