linux-kernel - [PATCH] dma-debug: use virt_addr_valid() to check linear addresses

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Message-ID: <1511320655-22752-1-git-send-email-miles.chen@mediatek.com>
Date:   Wed, 22 Nov 2017 11:17:35 +0800
From:   <miles.chen@...iatek.com>
To:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>
Subject: [PATCH] dma-debug: use virt_addr_valid() to check linear addresses

From: Miles Chen <miles.chen@...iatek.com>

Coverity found that the commit 3aaabbf1c39e ("lib/dma-debug.c:
fix incorrect pfn calculation") uses incorrect API to check
if a given address is a linear address.
The condition should be: (as discussed in Christoph's review)
if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
not
if (!is_vmalloc_addr(virt) && !virt_to_page(virt))

Fix it by using virt_addr_valid() instead of virt_to_page().

Signed-off-by: Miles Chen <miles.chen@...iatek.com>
---
 lib/dma-debug.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 1b34d21..4c08eb6 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1496,7 +1496,7 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
 		return;
 
 	/* handle vmalloc and linear addresses */
-	if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
+	if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
 		return;
 
 	entry->type      = dma_debug_coherent;
@@ -1528,7 +1528,7 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
 	};
 
 	/* handle vmalloc and linear addresses */
-	if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
+	if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
 		return;
 
 	if (is_vmalloc_addr(virt))
-- 
1.9.1