netdev - Re: [PATCH net v2 2/3] dpll: fix xa_alloc

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Message-ID: <nhvgxs7hu6oxshtj2vlowjcg7fw645xntjp75owtwbnovbacsn@3nuoo2gvxicf>
Date: Fri, 14 Mar 2025 14:33:48 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, pierre@...ckhpc.com, 
	hkallweit1@...il.com, linux@...linux.org.uk, maxime.chevallier@...tlin.com, 
	christophe.leroy@...roup.eu, arkadiusz.kubalewski@...el.com, vadim.fedorenko@...ux.dev
Subject: Re: [PATCH net v2 2/3] dpll: fix xa_alloc_cyclic() error handling

Wed, Mar 12, 2025 at 10:52:50AM +0100, michal.swiatkowski@...ux.intel.com wrote:
>In case of returning 1 from xa_alloc_cyclic() (wrapping) ERR_PTR(1) will
>be returned, which will cause IS_ERR() to be false. Which can lead to
>dereference not allocated pointer (pin).
>
>Fix it by checking if err is lower than zero.
>
>This wasn't found in real usecase, only noticed. Credit to Pierre.
>
>Fixes: 97f265ef7f5b ("dpll: allocate pin ids in cycle")
>Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

Reviewed-by: Jiri Pirko <jiri@...dia.com>