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From: Eran Ben Elisha <eranbe@mellanox.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>,
	Igor Konopko <igor.j.konopko@intel.com>,
	David Howells <dhowells@redhat.com>,
	"Mohit P . Tahiliani" <tahiliani@nitk.edu.in>,
	Takashi Sakamoto <o-takashi@sakamocchi.jp>,
	Matias Bjorling <mb@lightnvm.io>, Jiri Pirko <jiri@mellanox.com>,
	"David S . Miller" <davem@davemloft.net>,
	Jamal Hadi Salim <jhs@mojatatu.com>,
	Cong Wang <xiyou.wangcong@gmail.com>,
	Clemens Ladisch <clemens@ladisch.de>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	Joe Perches <joe@perches.com>, Arnd Bergmann <arnd@arndb.de>,
	Dan Carpenter <dan.carpenter@oracle.com>
Cc: "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-afs@lists.infradead.org" <linux-afs@lists.infradead.org>,
	"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/5] [RFC] devlink: Fix uninitialized error code in devlink_fmsg_prepare_skb()
Date: Tue, 28 May 2019 14:40:08 +0000	[thread overview]
Message-ID: <0f92eb11-20b5-c50b-1577-d3896f28c73b@mellanox.com> (raw)
In-Reply-To: <20190528142424.19626-6-geert@linux-m68k.org>



On 5/28/2019 5:24 PM, Geert Uytterhoeven wrote:
> With gcc 4.1:
> 
>      net/core/devlink.c: In function ‘devlink_fmsg_prepare_skb’:
>      net/core/devlink.c:4325: warning: ‘err’ may be used uninitialized in this function
> 
> Indeed, if the list has less than *start entries, an uninitialized error
> code will be returned.

The logic guarantees that start is smaller than the length of the list.
but I guess that the compiler can't detect that.

Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>

> 
> Fix this by preinitializing err to zero.
> 
> Fixes: 1db64e8733f65381 ("devlink: Add devlink formatted message (fmsg) API")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
> I don't know if this can really happen, and if this is the right fix.
> Perhaps err should be initialized to some valid error code instead?
> ---
>   net/core/devlink.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index d43bc52b8840d76b..91377e4eae9a43c1 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -4321,8 +4321,8 @@ devlink_fmsg_prepare_skb(struct devlink_fmsg *fmsg, struct sk_buff *skb,
>   {
>   	struct devlink_fmsg_item *item;
>   	struct nlattr *fmsg_nlattr;
> +	int err = 0;
>   	int i = 0;
> -	int err;
>   
>   	fmsg_nlattr = nla_nest_start_noflag(skb, DEVLINK_ATTR_FMSG);
>   	if (!fmsg_nlattr)
> 

  reply	other threads:[~2019-05-28 14:40 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28 14:24 [PATCH 0/5] Assorted fixes discovered with gcc 4.1 Geert Uytterhoeven
2019-05-28 14:24 ` [PATCH 1/5] lightnvm: Fix uninitialized pointer in nvm_remove_tgt() Geert Uytterhoeven
2019-05-29  8:08   ` Matias Bjørling
2019-05-29  8:12     ` Geert Uytterhoeven
2019-05-28 14:24 ` [PATCH 2/5] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet() Geert Uytterhoeven
2019-05-29 11:49   ` Arnd Bergmann
2019-05-28 14:24 ` [PATCH 3/5] net: sched: pie: Use ULL suffix for 64-bit constant Geert Uytterhoeven
2019-05-29 11:39   ` Arnd Bergmann
2019-05-28 14:24 ` [PATCH 4/5] ALSA: fireface: Use ULL suffixes for 64-bit constants Geert Uytterhoeven
2019-05-29  9:57   ` Takashi Sakamoto
2019-05-29 10:07     ` Takashi Iwai
2019-05-28 14:24 ` [PATCH 5/5] [RFC] devlink: Fix uninitialized error code in devlink_fmsg_prepare_skb() Geert Uytterhoeven
2019-05-28 14:40   ` Eran Ben Elisha [this message]
2019-05-29  8:04   ` Jiri Pirko
2019-05-28 16:30 ` [PATCH 2/5] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet() David Howells
2019-05-31 10:34 ` [PATCH] " David Howells
2019-06-03 21:30   ` David Miller
2019-06-04  7:17   ` Geert Uytterhoeven
2019-06-04  7:34   ` David Howells
2019-06-04  7:35     ` Geert Uytterhoeven

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