Re: [PATCH] net: phy: fix phy_get_internal_delay accessing an empty array

[Kévin L'hôpital]

----- Le 7 Mar 24, à 10:53, Russell King (Oracle) linux@xxxxxxxxxxxxxxx a écrit :

> On Thu, Mar 07, 2024 at 09:52:54AM +0100, Kévin L'hôpital wrote:
>> The phy_get_internal_delay function could try to access to an empty
>> array in the case that the driver is calling phy_get_internal_delay
>> without defining delay_values and rx-internal-delay-ps or
>> tx-internal-delay-ps is defined to 0 in the device-tree.
>> This will lead to "unable to handle kernel NULL pointer dereference at
>> virtual address 0". To avoid this kernel oops, the test should be delay
>> >= 0. As there is already delay < 0 test just before, the test could
>> only be size == 0.
>> 
>> Fixes: 92252eec913b ("net: phy: Add a helper to return the index for of the
>> internal delay")
>> Signed-off-by: Kévin L'hôpital <kevin.lhopital@xxxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Enguerrand de Ribaucourt
>> <enguerrand.de-ribaucourt@xxxxxxxxxxxxxxxxxxxx>
> 
> The sign-offs look wrong to me. They indicate the path that the patch is
> taking to be merged into mainline. Who is the author of this patch and
> who is passing it along? If it's co-development, then there is a specific
> tag for that.
> 
> For the actual patch itself:
> 
> Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
> 
> Thanks!
> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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I will send a V2 fixing this, thank you.

Kévin L'hôpital