linux-kernel - Re: [PATCH] scsi: Fix a double free in myrs

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Date:   Thu, 11 Mar 2021 11:43:51 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>, hare@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: Fix a double free in myrs_cleanup

On 3/11/21 7:30 AM, Lv Yunlong wrote:
> In myrs_cleanup, cs->mmio_base will be freed twice by
> iounmap().
> 
> Fixes: 77266186397c6 ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
> ---
>  drivers/scsi/myrs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/myrs.c b/drivers/scsi/myrs.c
> index 4adf9ded296a..329fd025c718 100644
> --- a/drivers/scsi/myrs.c
> +++ b/drivers/scsi/myrs.c
> @@ -2273,12 +2273,12 @@ static void myrs_cleanup(struct myrs_hba *cs)
>  	if (cs->mmio_base) {
>  		cs->disable_intr(cs);
>  		iounmap(cs->mmio_base);
> +		cs->mmio_base = NULL;
>  	}
>  	if (cs->irq)
>  		free_irq(cs->irq, cs);
>  	if (cs->io_addr)
>  		release_region(cs->io_addr, 0x80);
> -	iounmap(cs->mmio_base);
>  	pci_set_drvdata(pdev, NULL);
>  	pci_disable_device(pdev);
>  	scsi_host_put(cs->host);
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer