linux-kernel - Re: [PATCH v2] 9P FS: Fix wild-memory-access write in v9fs_get

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Date:   Sat, 11 Mar 2023 16:08:24 +0400
From:   Ivan Orlov <ivan.orlov0322@...il.com>
To:     Christian Schoenebeck <linux_oss@...debyte.com>, ericvh@...il.com,
        lucho@...kov.net, asmadeus@...ewreck.org
Cc:     v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        skhan@...uxfoundation.org, himadrispandya@...il.com,
        syzbot+cb1d16facb3cc90de5fb@...kaller.appspotmail.com
Subject: Re: [PATCH v2] 9P FS: Fix wild-memory-access write in v9fs_get_acl

On 3/11/23 15:17, Christian Schoenebeck wrote:
> I would have written it in different style:
> 
>      if (buffer_size)
>          retval = -ERANGE;
>      else if (attr_size > SSIZE_MAX)
>          retval = -EOVERFLOW;
>      else
>          retval = attr_size; /* request to get the attr_size */
> 
> But the behaviour change itself makes sense, so:
> 
> Reviewed-by: Christian Schoenebeck <linux_oss@...debyte.com>
> 
>>   	} else {
>>   		iov_iter_truncate(&to, attr_size);
>>   		retval = p9_client_read(attr_fid, 0, &to, &err);
>>
> 
> 

You are right, the condition can be simplified, thank you! I will 
rewrite it, send as v3 and mention you in 'suggested-by'.