netdev - Re: [PATCH] i40e: fix MMIO write access to an invalid page in i40e_clear

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Message-ID: <5cfd4c17-71a8-4bd8-972b-31fc0634f518@intel.com>
Date: Thu, 6 Mar 2025 08:59:16 +0100
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Kyungwook Boo <bookyungwook@...il.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, "Loktionov, Aleksandr"
	<aleksandr.loktionov@...el.com>
Subject: Re: [PATCH] i40e: fix MMIO write access to an invalid page in
 i40e_clear_hw

On 3/6/25 06:25, Kyungwook Boo wrote:
> In i40e_clear_hw(), when the device sends a specific input(e.g., 0),
> an integer underflow in the num_{pf,vf}_int variables can occur,
> leading to MMIO write access to an invalid page.
> 
> To fix this, we change the type of the unsigned integer variables
> num_{pf,vf}_int to signed integers. Additionally, in the for-loop where the
> integer underflow occurs, we also change the type of the loop variable i to
> a signed integer.
> 
> Signed-off-by: Kyungwook Boo <bookyungwook@...il.com>
> Signed-off-by: Loktionov, Aleksandr <aleksandr.loktionov@...el.com>

when Alex said "make sure I signed too" he meant:
"make sure the variable @i is signed too", not the Sign-off ;)

(please wait 24h for the next submission, and also put "iwl-next" after
the "PATCH" word)

> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

I didn't signed that either

> Link: https://lore.kernel.org/lkml/ffc91764-1142-4ba2-91b6-8c773f6f7095@gmail.com/T/
> ---
>   drivers/net/ethernet/intel/i40e/i40e_common.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
> index 370b4bddee44..9a73cb94dc5e 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_common.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
> @@ -817,8 +817,8 @@ int i40e_pf_reset(struct i40e_hw *hw)
>   void i40e_clear_hw(struct i40e_hw *hw)
>   {
>   	u32 num_queues, base_queue;
> -	u32 num_pf_int;
> -	u32 num_vf_int;
> +	s32 num_pf_int;
> +	s32 num_vf_int;
>   	u32 num_vfs;
>   	u32 i, j;

It's fine to move the declaration of @i into the for loop, but
you have to remove it here, otherwise it's shadowing, which we
avoid.

>   	u32 val;
> @@ -848,18 +848,18 @@ void i40e_clear_hw(struct i40e_hw *hw)
>   	/* stop all the interrupts */
>   	wr32(hw, I40E_PFINT_ICR0_ENA, 0);
>   	val = 0x3 << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT;
> -	for (i = 0; i < num_pf_int - 2; i++)
> +	for (s32 i = 0; i < num_pf_int - 2; i++)
>   		wr32(hw, I40E_PFINT_DYN_CTLN(i), val);
>   
>   	/* Set the FIRSTQ_INDX field to 0x7FF in PFINT_LNKLSTx */
>   	val = eol << I40E_PFINT_LNKLST0_FIRSTQ_INDX_SHIFT;
>   	wr32(hw, I40E_PFINT_LNKLST0, val);
> -	for (i = 0; i < num_pf_int - 2; i++)
> +	for (s32 i = 0; i < num_pf_int - 2; i++)
>   		wr32(hw, I40E_PFINT_LNKLSTN(i), val);
>   	val = eol << I40E_VPINT_LNKLST0_FIRSTQ_INDX_SHIFT;
>   	for (i = 0; i < num_vfs; i++)
>   		wr32(hw, I40E_VPINT_LNKLST0(i), val);
> -	for (i = 0; i < num_vf_int - 2; i++)
> +	for (s32 i = 0; i < num_vf_int - 2; i++)
>   		wr32(hw, I40E_VPINT_LNKLSTN(i), val);
>   
>   	/* warn the HW of the coming Tx disables */