linux-kernel - Re: [PATCH v2 1/2] net: mana: Fix memory leak in mana_gd_setup

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Message-ID: <Z1fcIa7n+hI+v2Nq@mev-dev.igk.intel.com>
Date: Tue, 10 Dec 2024 07:13:53 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Maxim Levitsky <mlevitsk@...hat.com>
Cc: kvm@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
	linux-hyperv@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
	Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Leon Romanovsky <leon@...nel.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
	Shradha Gupta <shradhagupta@...ux.microsoft.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>, Long Li <longli@...rosoft.com>,
	Yury Norov <yury.norov@...il.com>
Subject: Re: [PATCH v2 1/2] net: mana: Fix memory leak in mana_gd_setup_irqs

On Mon, Dec 09, 2024 at 12:57:50PM -0500, Maxim Levitsky wrote:
> Commit 8afefc361209 ("net: mana: Assigning IRQ affinity on HT cores")
> added memory allocation in mana_gd_setup_irqs of 'irqs' but the code
> doesn't free this temporary array in the success path.
> 
> This was caught by kmemleak.
> 
> Fixes: 8afefc361209 ("net: mana: Assigning IRQ affinity on HT cores")
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>  drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> index e97af7ac2bb2..aba188f9f10f 100644
> --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> @@ -1375,6 +1375,7 @@ static int mana_gd_setup_irqs(struct pci_dev *pdev)
>  	gc->max_num_msix = nvec;
>  	gc->num_msix_usable = nvec;
>  	cpus_read_unlock();
> +	kfree(irqs);

Ther is still memleak in case of jumping to free_irq_vector when
gc->irq_contexts allocation is failing.

Thanks
>  	return 0;
>  
>  free_irq:
> -- 
> 2.26.3