linux-kernel - [PATCH][next][V2] iommu/mediatek: Fix unsigned domid comparison with less than zero

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Date:   Thu,  4 Feb 2021 15:00:01 +0000
From:   Colin King <colin.king@...onical.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next][V2] iommu/mediatek: Fix unsigned domid comparison with less than zero

From: Colin Ian King <colin.king@...onical.com>

Currently the check for domid < 0 is always false because domid
is unsigned. Fix this by casting domid to an int before making
the comparison.

Addresses-Coverity: ("Unsigned comparison against 0")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---

V2: cast domid rather than making it an int. Replace L with : in
    the commit message.

---
 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..1f262621ef19 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -645,7 +645,7 @@ static void mtk_iommu_get_resv_regions(struct device *dev,
 	struct iommu_resv_region *region;
 	int prot = IOMMU_WRITE | IOMMU_READ;
 
-	if (domid < 0)
+	if ((int)domid < 0)
 		return;
 	curdom = data->plat_data->iova_region + domid;
 	for (i = 0; i < data->plat_data->iova_region_nr; i++) {
-- 
2.29.2