linux-kernel - [PATCH RFC v1 7/7] swiotlb: fix the slot

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Message-Id: <20220609005553.30954-8-dongli.zhang@oracle.com>
Date:   Wed,  8 Jun 2022 17:55:53 -0700
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     iommu@...ts.linux-foundation.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        virtualization@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, hch@...radead.org,
        m.szyprowski@...sung.com, jgross@...e.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        sstabellini@...nel.org, mpe@...erman.id.au, konrad.wilk@...cle.com,
        mst@...hat.com, jasowang@...hat.com, joe.jin@...cle.com
Subject: [PATCH RFC v1 7/7] swiotlb: fix the slot_addr() overflow

Since the type of swiotlb slot index is a signed integer, the
"((idx) << IO_TLB_SHIFT)" will returns incorrect value. As a result, the
slot_addr() returns a value which is smaller than the expected one.

E.g., the 'tlb_addr' generated in swiotlb_tbl_map_single() may return a
value smaller than the expected one. As a result, the swiotlb_bounce()
will access a wrong swiotlb slot.

Cc: Konrad Wilk <konrad.wilk@...cle.com>
Cc: Joe Jin <joe.jin@...cle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 kernel/dma/swiotlb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 0dcdd25ea95d..c64e557de55c 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -531,7 +531,8 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
 	}
 }
 
-#define slot_addr(start, idx)	((start) + ((idx) << IO_TLB_SHIFT))
+#define slot_addr(start, idx)	((start) + \
+				(((unsigned long)idx) << IO_TLB_SHIFT))
 
 /*
  * Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
-- 
2.17.1