linux-kernel - Re: [PATCH][next] iommu/mediatek: Fix unsigned domid comparison with less than zero

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Date:   Thu, 4 Feb 2021 09:11:09 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Colin King <colin.king@...onical.com>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Anan sun <anan.sun@...iatek.com>,
        "Chao Hao" <chao.hao@...iatek.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] iommu/mediatek: Fix unsigned domid comparison
 with less than zero

On Wed, 2021-02-03 at 13:59 +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the check for domid < 0 is always false because domid
> is unsigned.  Fix this by making it signed.
> 
> Addresses-CoverityL ("Unsigned comparison against 0")
> Fixes: ab1d5281a62b ("iommu/mediatek: Add iova reserved function")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thanks for the fix.

Reviewed-by: Yong Wu <yong.wu@...iatek.com>

> ---
>  drivers/iommu/mtk_iommu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 0ad14a7604b1..823d719945b2 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -640,7 +640,7 @@ static void mtk_iommu_get_resv_regions(struct device *dev,
>  				       struct list_head *head)
>  {
>  	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
> -	unsigned int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;
> +	int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;
>  	const struct mtk_iommu_iova_region *resv, *curdom;
>  	struct iommu_resv_region *region;
>  	int prot = IOMMU_WRITE | IOMMU_READ;