linux-kernel - Re: [PATCH] net: ipv4: Fix uninitialized pointer warning in fnhe_remove

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Message-ID: <b137f4c6-9cbd-456d-b839-bc77d6ef9079@kernel.org>
Date: Thu, 17 Apr 2025 22:03:51 -0700
From: David Ahern <dsahern@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>, purvayeshi550@...il.com
Cc: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org,
 kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 pabeni@...hat.com
Subject: Re: [PATCH] net: ipv4: Fix uninitialized pointer warning in
 fnhe_remove_oldest

On 4/17/25 4:00 PM, Kuniyuki Iwashima wrote:
> From: Purva Yeshi <purvayeshi550@...il.com>
> Date: Thu, 17 Apr 2025 15:11:26 +0530
>> Fix Smatch-detected issue:
>> net/ipv4/route.c:605 fnhe_remove_oldest() error:
>> uninitialized symbol 'oldest_p'.
>>
>> Initialize oldest_p to NULL to avoid uninitialized pointer warning in
>> fnhe_remove_oldest.
> 
> How does it remain uninitialised ?
> 
> update_or_create_fnhe() ensures the bucket is not empty before
> calling fnhe_remove_oldest().
> 

agreed. Not the simplest logic, but I do not see how oldest_p can be
unset after the loop.