linux-kernel - Re: [PATCH v2] wifi: mt76: add a check of vzalloc in mt7615_coredump

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Message-ID: <Y/y5Asxw3T3m4jCw@lore-desk>
Date:   Mon, 27 Feb 2023 15:06:58 +0100
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     void0red <void0red@...il.com>
Cc:     angelogioacchino.delregno@...labora.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, kvalo@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-wireless@...r.kernel.org,
        lorenzo@...nel.org, matthias.bgg@...il.com, nbd@....name,
        netdev@...r.kernel.org, pabeni@...hat.com, ryder.lee@...iatek.com,
        sean.wang@...iatek.com, shayne.chen@...iatek.com
Subject: Re: [PATCH v2] wifi: mt76: add a check of vzalloc in
 mt7615_coredump_work

> From: Kang Chen <void0red@...il.com>
> 
> vzalloc may fails, dump might be null and will cause
> illegal address access later.
> 
> Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
> Signed-off-by: Kang Chen <void0red@...il.com>
> ---
> v2 -> v1: add Fixes tag
> 
>  drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> index a95602473..73d84c301 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> @@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
>  	}
>  
>  	dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
> +	if (!dump)
> +		return;
> +
>  	data = dump;
>  
>  	while (true) {
> -- 
> 2.34.1
> 

revieweing the code I guess the right approach would be the one used in
mt7921_coredump_work():
- free pending skbs
- not run dev_coredumpv()

What do you think?

Regards,
Lorenzo

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