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Message-ID: <7a561aac-08c6-5a20-6254-82b2c2601d13@suse.de>
Date:   Mon, 10 Jul 2023 11:13:16 +0300
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Subject: Re: [PATCH] ethernet: e1000e: Fix possible uninit bug
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To:     Yu Hao <yhao016@ucr.edu>, jesse.brandeburg@intel.com,
        anthony.l.nguyen@intel.com, davem@davemloft.net,
        edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
        intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>
References: <CA+UBctC57Lx=8Eh6P51cVz+cyb02GE_B-dWnYhffWoc-nm7v6Q@mail.gmail.com>
From:   Denis Kirjanov <dkirjanov@suse.de>
In-Reply-To: <CA+UBctC57Lx=8Eh6P51cVz+cyb02GE_B-dWnYhffWoc-nm7v6Q@mail.gmail.com>
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On 7/5/23 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@ucr.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;
> 
> -       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" :

the same case appears in other places in the driver like e1000_setup_rctl()