netdev - Re: [PATCH net v2] be2net: Fix uninitialized variable

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Date:   Wed, 27 Jul 2022 10:27:22 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hristo Venev <hristo@...ev.name>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net v2] be2net: Fix uninitialized variable

On Tue, 26 Jul 2022 19:54:54 +0300 Hristo Venev wrote:
> The following error is reported by Smatch:
> 
>     drivers/net/ethernet/emulex/benet/be_ethtool.c:1392 be_get_module_eeprom()
>     error: uninitialized symbol 'status'.
> 
> When `eeprom->len == 0` and `eeprom->begin == PAGE_DATA_LEN`, we end
> up with neither of the pages being read, so `status` is left
> uninitialized.
> 
> While it appears that no caller will actually give `get_module_eeprom`
> a zero length, fixing this issue is trivial.

If there is no caller that can trigger this - it's not a fix. Fixes are
for bugs which can be triggered. Please repost against net-next without
the Fixes tag. Please don't post the v3 in reply to v2, just add a
changelog under the --- marker and make a fresh thread.

> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Fixes: d7241f679a59 ("be2net: Fix buffer overflow in be_get_module_eeprom")
> Signed-off-by: Hristo Venev <hristo@...ev.name>
> ---
>  drivers/net/ethernet/emulex/benet/be_ethtool.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c b/drivers/net/ethernet/emulex/benet/be_ethtool.c
> index bd0df189d871..2145882d00cc 100644
> --- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
> +++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
> @@ -1361,7 +1361,7 @@ static int be_get_module_eeprom(struct net_device *netdev,
>  				struct ethtool_eeprom *eeprom, u8 *data)
>  {
>  	struct be_adapter *adapter = netdev_priv(netdev);
> -	int status;
> +	int status = 0;
>  	u32 begin, end;
>  
>  	if (!check_privilege(adapter, MAX_PRIVILEGES))