linux-kernel - Re: [PATCH] net: phy: fix phy_get_internal

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Date: Thu, 7 Mar 2024 05:47:22 -0500 (EST)
From: Kévin L'hôpital <kevin.lhopital@...oirfairelinux.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
	"David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Dan Murphy <dmurphy@...com>, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
Subject: Re: [PATCH] net: phy: fix phy_get_internal_delay accessing an empty
 array


----- Le 7 Mar 24, à 10:53, Russell King (Oracle) linux@...linux.org.uk 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@...oirfairelinux.com>
>> Signed-off-by: Enguerrand de Ribaucourt
>> <enguerrand.de-ribaucourt@...oirfairelinux.com>
> 
> 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@...linux.org.uk>
> 
> Thanks!
> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

I will send a V2 fixing this, thank you.

Kévin L'hôpital