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

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Date:   Mon, 7 Mar 2022 10:43:28 +0100
From:   Petr Machata <petrm@...dia.com>
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()


trix@...hat.com writes:

> 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>

Reviewed-by: Petr Machata <petrm@...dia.com>

Thanks!