netdev - Re: [PATCH net] net: phy: fix phy_read_poll_timeout argument type in genphy

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Message-ID: <20240314164826.161bd398@kernel.org>
Date: Thu, 14 Mar 2024 16:48:26 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Nikita Kiryushin <kiryushin@...ud.ru>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Oleksij Rempel <o.rempel@...gutronix.de>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 lvc-project@...uxtesting.org
Subject: Re: [PATCH net] net: phy: fix phy_read_poll_timeout argument type
 in genphy_loopback

On Thu, 14 Mar 2024 14:15:37 +0300 Nikita Kiryushin wrote:
> read_poll_timeout inside phy_read_poll_timeout can set val negative
> in some cases (for example, __mdiobus_read inside phy_read can return
> -EOPNOTSUPP).
> 
> Supposedly, commit 4ec732951702 ("net: phylib: fix phy_read*_poll_timeout()")
> should fix problems with wrong-signed vals, but I do not see how
> as val is sent to phy_read as is and __val = phy_read (not val)
> is checked for sign.
> 
> Change val type for signed to allow better error handling as done in other
> phy_read_poll_timeout callers. This will not fix any error handling
> by itself, but allows, for example, to modify cond with appropriate
> sign check or check resulting val separately.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 014068dcb5b1 ("net: phy: genphy_loopback: add link speed configuration")
> Signed-off-by: Nikita Kiryushin <kiryushin@...ud.ru>

Please use git send email, the patch is mangled.
-- 
pw-bot: cr