linux-kernel - Re: [Intel-wired-lan] [PATCH net-next v3] ice: Adjust over allocation of memory in ice_sched_add_root_node() and ice_sched_add

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Message-ID: <190d0cdc-d6de-4526-b235-91b25b50c905@intel.com>
Date: Tue, 9 Jul 2024 11:11:30 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>, Aleksandr Mishin <amishin@...rgos.ru>
CC: <lvc-project@...uxtesting.org>, Eric Dumazet <edumazet@...gle.com>,
	<linux-kernel@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>,
	<intel-wired-lan@...ts.osuosl.org>, Simon Horman <horms@...nel.org>,
	<netdev@...r.kernel.org>, Tony Nguyen <anthony.l.nguyen@...el.com>, "Paolo
 Abeni" <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH net-next v3] ice: Adjust over allocation
 of memory in ice_sched_add_root_node() and ice_sched_add_node()

On 7/9/24 10:54, Paul Menzel wrote:
> [Cc: -anirudh.venkataramanan@...el.com (Address rejected)]
> 
> Am 09.07.24 um 10:49 schrieb Paul Menzel:
>> Dear Aleksandr,
>>
>>
>> Thank you for your patch.
>>
>>
>> Am 08.07.24 um 20:27 schrieb Aleksandr Mishin:
>>> In ice_sched_add_root_node() and ice_sched_add_node() there are calls to
>>> devm_kcalloc() in order to allocate memory for array of pointers to
>>> 'ice_sched_node' structure. But incorrect types are used as sizeof()
>>> arguments in these calls (structures instead of pointers) which leads to
>>> over allocation of memory.
>>
>> If you have the explicit size at hand, it’d be great if you added 
>> those to the commit message.
>>
>>> Adjust over allocation of memory by correcting types in devm_kcalloc()
>>> sizeof() arguments.
>>>
>>> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>>
>> Maybe mention, that Coverity found that too, and the warning was 
>> disabled, and use that commit in Fixes: tag? That’d be commit 
>> b36c598c999c (ice: Updates to Tx scheduler code), different from the 
>> one you used.

this version does not have any SHA mentioned :)

>>
>> `Documentation/process/submitting-patches.rst` says:
>>
>>> A Fixes: tag indicates that the patch fixes an issue in a previous
>>> commit. It is used to make it easy to determine where a bug
>>> originated, which can help review a bug fix. This tag also assists
>>> the stable kernel team in determining which stable kernel versions
>>> should receive your fix. This is the preferred method for indicating
>>> a bug fixed by the patch.

so, this is not a "fix" per definition of a fix: "your patch changes
observable misbehavior"
If the over-allocation would be counted in megabytes, then it will
be a different case.