netdev - Re: [PATCH net-next] net: tipc: avoid possible garbage value

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Message-ID: <CAFhGd8ruRrZM0Q2Z0UJdf98gKvtP64H2k08gvB_=97pWs4p8cA@mail.gmail.com>
Date: Thu, 12 Sep 2024 14:38:53 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: Su Hui <suhui@...china.com>
Cc: jmaloy@...hat.com, ying.xue@...driver.com, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, nathan@...nel.org, 
	ndesaulniers@...gle.com, morbo@...gle.com, tuong.t.lien@...tech.com.au, 
	netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] net: tipc: avoid possible garbage value

Hi,

On Thu, Sep 12, 2024 at 4:01 AM Su Hui <suhui@...china.com> wrote:
>
> Clang static checker (scan-build) warning:
> net/tipc/bcast.c:305:4:
> The expression is an uninitialized value. The computed value will also
> be garbage [core.uninitialized.Assign]
>   305 |                         (*cong_link_cnt)++;
>       |                         ^~~~~~~~~~~~~~~~~~
>
> tipc_rcast_xmit() will increase cong_link_cnt's value, but cong_link_cnt
> is uninitialized. Although it won't really cause a problem, it's better
> to fix it.

Agreed.

Reviewed-by: Justin Stitt <justinstitt@...gle.com>
>
> Fixes: dca4a17d24ee ("tipc: fix potential hanging after b/rcast changing")
> Signed-off-by: Su Hui <suhui@...china.com>
> ---
>  net/tipc/bcast.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
> index 593846d25214..a3699be6a634 100644
> --- a/net/tipc/bcast.c
> +++ b/net/tipc/bcast.c
> @@ -321,7 +321,7 @@ static int tipc_mcast_send_sync(struct net *net, struct sk_buff *skb,
>         struct tipc_msg *hdr, *_hdr;
>         struct sk_buff_head tmpq;
>         struct sk_buff *_skb;
> -       u16 cong_link_cnt;
> +       u16 cong_link_cnt = 0;
>         int rc = 0;
>
>         /* Is a cluster supporting with new capabilities ? */
> --
> 2.30.2
>

Thanks
Justin