netdev - Re: [PATCH] net: rtnetlink: fix error handling in rtnl_fill

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Date:   Mon, 7 Mar 2022 09:16:07 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     trix@...hat.com
Cc:     davem@...emloft.net, kuba@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, idosch@...dia.com, petrm@...dia.com,
        edumazet@...gle.com, avagin@...il.com, yajun.deng@...ux.dev,
        johannes.berg@...el.com, cong.wang@...edance.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] net: rtnetlink: fix error handling in
 rtnl_fill_statsinfo()

On Sat, Mar 05, 2022 at 10:13:46AM -0800, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> The clang static analyzer reports this issue
> rtnetlink.c:5481:2: warning: Undefined or garbage
>   value returned to caller
>   return err;
>   ^~~~~~~~~~
> 
> There is a function level err variable, in the
> list_for_each_entry_rcu block there is a shadow
> err.  Remove the shadow.
> 
> In the same block, the call to nla_nest_start_noflag()
> can fail without setting an err.  Set the err
> to -EMSGSIZE.
> 
> Fixes: 216e690631f5 ("net: rtnetlink: rtnl_fill_statsinfo(): Permit non-EMSGSIZE error returns")
> Signed-off-by: Tom Rix <trix@...hat.com>

For net-next:

Reviewed-by: Ido Schimmel <idosch@...dia.com>

Thanks