linux-kernel - Re: [PATCH net v2] broadcom: b44: prevent uninitialized value usage

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Message-ID: <01b3d882-8f33-494f-a75c-3e0e77c52b12@redhat.com>
Date: Fri, 5 Dec 2025 11:11:45 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Alexey Simakov <bigalex934@...il.com>,
 Michael Chan <michael.chan@...adcom.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, Jonas Gorski
 <jonas.gorski@...il.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 "John W. Linville" <linville@...driver.com>, Michael Buesch <mb@...sch.de>,
 linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH net v2] broadcom: b44: prevent uninitialized value usage

On 12/5/25 8:17 AM, Alexey Simakov wrote:
> On execution path with raised B44_FLAG_EXTERNAL_PHY, b44_readphy()
> leaves bmcr value uninitialized and it is used later in the code.
> 
> Add check of this flag at the beginning of the b44_nway_reset() and
> exit early of the function with restarting autonegotiation if an
> external PHY is used.
> 
> Found by Linux Verification Center (linuxtesting.org) with Svace.
> 
> Fixes: 753f492093da ("[B44]: port to native ssb support")
> Signed-off-by: Alexey Simakov <bigalex934@...il.com>

You need to include the netdev ML in the recipients list to get this
patch processed.

Thanks,

Paolo