linux-kernel - Re: [Intel-wired-lan] [PATCH] ethernet: e1000e: Fix possible uninit bug

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Message-ID: <CA+UBctDVMXGcCi1ZVepNCGSZvhw4OR8fqWOOQjLkOQ6NXNAnJA@mail.gmail.com>
Date:   Sun, 9 Jul 2023 17:55:22 -0700
From:   Yu Hao <yhao016@....edu>
To:     "Neftin, Sasha" <sasha.neftin@...el.com>
Cc:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, intel-wired-lan@...ts.osuosl.org,
        netdev@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Ruinskiy, Dima" <dima.ruinskiy@...el.com>,
        "Edri, Michael" <michael.edri@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH] ethernet: e1000e: Fix possible uninit bug

I think u16 phy_data = 0 would not hurt us.
Let me submit a patch which just initializes u16 phy_data = 0.

Yu Hao

On Wed, Jul 5, 2023 at 8:47 AM Neftin, Sasha <sasha.neftin@...el.com> wrote:
>
> On 7/5/2023 03:10, Yu Hao wrote:
> > The variable phy_data should be initialized in function e1e_rphy.
> > However, there is not return value check, which means there is a
> > possible uninit read later for the variable.
> >
> > Signed-off-by: Yu Hao <yhao016@....edu>
> > ---
> >   drivers/net/ethernet/intel/e1000e/netdev.c | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c
> > b/drivers/net/ethernet/intel/e1000e/netdev.c
> > index 771a3c909c45..455af5e55cc6 100644
> > --- a/drivers/net/ethernet/intel/e1000e/netdev.c
> > +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
> > @@ -6910,8 +6910,11 @@ static int __e1000_resume(struct pci_dev *pdev)
> >      /* report the system wakeup cause from S3/S4 */
> >      if (adapter->flags2 & FLAG2_HAS_PHY_WAKEUP) {
> >          u16 phy_data;
> > +       s32 ret_val;
>
> why just not initialize u16 phy_data = 0? How did it hurt us? (legacy)
>
> >
> > -       e1e_rphy(&adapter->hw, BM_WUS, &phy_data);
> > +       ret_val = e1e_rphy(&adapter->hw, BM_WUS, &phy_data);
> > +       if (ret_val)
> > +           return ret_val;
> >          if (phy_data) {
> >              e_info("PHY Wakeup cause - %s\n",
> >                     phy_data & E1000_WUS_EX ? "Unicast Packet" :
>