linux-kernel - Re: [PATCH net 1/1] octeontx2-af: CGX: fix bitmap leaks

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Message-ID: <7cf5475d-b257-4595-b306-53952c8a63b7@intel.com>
Date: Mon, 20 Oct 2025 17:45:41 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Bo Sun <bo@...xify.com>
CC: <kuba@...nel.org>, <pabeni@...hat.com>, <sgoutham@...vell.com>,
	<lcherian@...vell.com>, <gakula@...vell.com>, <jerinj@...vell.com>,
	<hkelam@...vell.com>, <sbhatta@...vell.com>, <andrew+netdev@...n.ch>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH net 1/1] octeontx2-af: CGX: fix bitmap leaks

From: Bo Sun <bo@...xify.com>
Date: Mon, 20 Oct 2025 22:31:12 +0800

> The RX/TX flow-control bitmaps (rx_fc_pfvf_bmap and tx_fc_pfvf_bmap)
> are allocated by cgx_lmac_init() but never freed in cgx_lmac_exit().
> Unbinding and rebinding the driver therefore triggers kmemleak:
> 
>     unreferenced object (size 16):
>         backtrace:
>           rvu_alloc_bitmap
>           cgx_probe
> 
> Free both bitmaps during teardown.
> 
> Fixes: e740003874ed ("octeontx2-af: Flow control resource management")
> Cc: stable@...r.kernel.org
> Signed-off-by: Bo Sun <bo@...xify.com>

Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>

> ---
>  drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> index ec0e11c77cbf..f56e6782c4de 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> @@ -1823,6 +1823,8 @@ static int cgx_lmac_exit(struct cgx *cgx)
>  		cgx->mac_ops->mac_pause_frm_config(cgx, lmac->lmac_id, false);
>  		cgx_configure_interrupt(cgx, lmac, lmac->lmac_id, true);
>  		kfree(lmac->mac_to_index_bmap.bmap);
> +		kfree(lmac->rx_fc_pfvf_bmap.bmap);
> +		kfree(lmac->tx_fc_pfvf_bmap.bmap);
>  		kfree(lmac->name);
>  		kfree(lmac);
>  	}

Thanks,
Olek