netdev - Re: [PATCH 1/2] net: ll_temac: fix DMA resources leak

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Message-ID: <87ilgo8arm.fsf@geanix.com>
Date:   Mon, 30 Jan 2023 13:30:53 +0100
From:   esben@...nix.com
To:     Jakub Kicinski <kuba@...nel.org>,
        Jonas Suhr Christensen <jsc@...raculum.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, michal.simek@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: ll_temac: fix DMA resources leak

Jakub Kicinski <kuba@...nel.org> writes:

> On Thu, 26 Jan 2023 11:16:06 +0100 Jonas Suhr Christensen wrote:
>> Add missing conversion of address when unmapping dma region causing
>> unmapping to silently fail. At some point resulting in buffer
>> overrun eg. when releasing device.
>
> Could you add a Fixes tag pointing to the commit which introduced 
> the bug? It will help the stable teams backport the patch.

Fixes: fdd7454ecb29 ("net: ll_temac: Fix support for little-endian platforms")

> When reposting please put [PATCH net v2] as the prefix (noting 
> the target tree for the benefit of bots/CIs).
>
>> Signed-off-by: Jonas Suhr Christensen <jsc@...raculum.org>
>> ---
>>  drivers/net/ethernet/xilinx/ll_temac_main.c | 8 +++++++-
>>  1 file changed, 7 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
>> index 1066420d6a83..66c04027f230 100644
>> --- a/drivers/net/ethernet/xilinx/ll_temac_main.c
>> +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
>> @@ -300,6 +300,7 @@ static void temac_dma_bd_release(struct net_device *ndev)
>>  {
>>  	struct temac_local *lp = netdev_priv(ndev);
>>  	int i;
>> +	struct cdmac_bd *bd;
>
> nit: we like variable declarations longest to shortest in networking
>  so before the int i; pls
>
>>  	/* Reset Local Link (DMA) */
>>  	lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);