netdev - RE: [Intel-wired-lan] [PATCH net] i40e: prevent crash on probe if hw registers have invalid values

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Date: Wed, 11 Oct 2023 06:13:53 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: mschmidt <mschmidt@...hat.com>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>
CC: "Brandeburg, Jesse" <jesse.brandeburg@...el.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, Shannon Nelson
	<shannon.nelson@....com>
Subject: RE: [Intel-wired-lan] [PATCH net] i40e: prevent crash on probe if hw
 registers have invalid values

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Michal Schmidt
> Sent: Friday, October 6, 2023 4:42 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Brandeburg, Jesse <jesse.brandeburg@...el.com>; netdev@...r.kernel.org; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Jeff Kirsher <jeffrey.t.kirsher@...el.com>; Shannon Nelson <shannon.nelson@....com>
> Subject: [Intel-wired-lan] [PATCH net] i40e: prevent crash on probe if hw registers have invalid values
>
> The hardware provides the indexes of the first and the last available
> queue and VF. From the indexes, the driver calculates the numbers of
> queues and VFs. In theory, a faulty device might say the last index is
> smaller than the first index. In that case, the driver's calculation
> would underflow, it would attempt to write to non-existent registers
> outside of the ioremapped range and crash.
>
> I ran into this not by having a faulty device, but by an operator error.
> I accidentally ran a QE test meant for i40e devices on an ice device.
> The test used 'echo i40e > /sys/...ice PCI device.../driver_override',
> bound the driver to the device and crashed in one of the wr32 calls in
> i40e_clear_hw.
>
> Add checks to prevent underflows in the calculations of num_queues and
> num_vfs. With this fix, the wrong device probing reports errors and
> returns a failure without crashing.
>
> Fixes: 838d41d92a90 ("i40e: clear all queues and interrupts")
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_common.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)