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Message-Id: <20230810091955.3579004-1-m.szyprowski@samsung.com>
Date: Thu, 10 Aug 2023 11:19:55 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
Russell King <linux@...linux.org.uk>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Rapoport <rppt@...nel.org>
Subject: [PATCH] arm: dma-mapping: don't call folio_next() beyond the
requested region
Add a check for the non-zero offset case to avoid calling folio_next()
beyond the requested region and relying on its parameters.
Fixes: cc24e9c0895c ("arm: implement the new page table range API")
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Suggested-by: Matthew Wilcox <willy@...radead.org>
---
arch/arm/mm/dma-mapping.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 0474840224d9..6c952d6899f2 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -715,6 +715,8 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
if (offset) {
left -= folio_size(folio) - offset;
+ if (left <= 0)
+ return;
folio = folio_next(folio);
}
--
2.34.1
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