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: <033111e2-e743-4523-8c4f-7d5f1c801e65@molgen.mpg.de>
Date: Tue, 9 Jul 2024 10:49:57 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Aleksandr Mishin <amishin@...rgos.ru>
Cc: Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>,
 lvc-project@...uxtesting.org, intel-wired-lan@...ts.osuosl.org,
 linux-kernel@...r.kernel.org, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>, Eric Dumazet <edumazet@...gle.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>, netdev@...r.kernel.org,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "David S. Miller" <davem@...emloft.net>, Simon Horman <horms@...nel.org>
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()

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.

`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.


> Suggested-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
> ---
> v3:
>    - Update comment and use the correct entities as suggested by Przemek
> v2: https://lore.kernel.org/all/20240706140518.9214-1-amishin@t-argos.ru/
>    - Update comment, remove 'Fixes' tag and change the tree from 'net' to
>      'net-next' as suggested by Simon
>      (https://lore.kernel.org/all/20240706095258.GB1481495@kernel.org/)
> v1: https://lore.kernel.org/all/20240705163620.12429-1-amishin@t-argos.ru/
> 
>   drivers/net/ethernet/intel/ice/ice_sched.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c b/drivers/net/ethernet/intel/ice/ice_sched.c
> index ecf8f5d60292..6ca13c5dcb14 100644
> --- a/drivers/net/ethernet/intel/ice/ice_sched.c
> +++ b/drivers/net/ethernet/intel/ice/ice_sched.c
> @@ -28,9 +28,8 @@ ice_sched_add_root_node(struct ice_port_info *pi,
>   	if (!root)
>   		return -ENOMEM;
>   
> -	/* coverity[suspicious_sizeof] */
>   	root->children = devm_kcalloc(ice_hw_to_dev(hw), hw->max_children[0],
> -				      sizeof(*root), GFP_KERNEL);
> +				      sizeof(*root->children), GFP_KERNEL);
>   	if (!root->children) {
>   		devm_kfree(ice_hw_to_dev(hw), root);
>   		return -ENOMEM;
> @@ -186,10 +185,9 @@ ice_sched_add_node(struct ice_port_info *pi, u8 layer,
>   	if (!node)
>   		return -ENOMEM;
>   	if (hw->max_children[layer]) {
> -		/* coverity[suspicious_sizeof] */
>   		node->children = devm_kcalloc(ice_hw_to_dev(hw),
>   					      hw->max_children[layer],
> -					      sizeof(*node), GFP_KERNEL);
> +					      sizeof(*node->children), GFP_KERNEL);
>   		if (!node->children) {
>   			devm_kfree(ice_hw_to_dev(hw), node);
>   			return -ENOMEM;


Kind regards,

Paul