linux-kernel - Re: SUNRPC: Checking a kmemdup() call in xdr_netobj

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Date:   Mon, 14 Oct 2019 18:33:50 -0400
From:   "J. Bruce Fields" <bfields@...ldses.org>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     linux-nfs@...r.kernel.org,
        Anna Schumaker <anna.schumaker@...app.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org, Aditya Pakki <pakki001@....edu>,
        Kangjie Lu <kjlu@....edu>, Navid Emamdoost <emamd001@....edu>,
        Stephen McCamant <smccaman@....edu>
Subject: Re: SUNRPC: Checking a kmemdup() call in xdr_netobj_dup()

On Sat, Oct 12, 2019 at 08:20:04PM +0200, Markus Elfring wrote:
> I tried another script for the semantic patch language out.
> This source code analysis approach points out that the implementation
> of the function “xdr_netobj_dup” contains still an unchecked call
> of the function “kmemdup”.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/sunrpc/xdr.h?id=1c0cc5f1ae5ee5a6913704c0d75a6e99604ee30a#n167
> https://elixir.bootlin.com/linux/v5.4-rc2/source/include/linux/sunrpc/xdr.h#L167
> 
> How do you think about to improve it?

On a quick check--I see five xdr_netobj_dup callers, and all of them
check whether dst->data is NULL.

Sounds like a false positive for your tool?

--b.