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From: Igor Klochko <igor.klochko@gmail.com>
To: hch@lst.de
Cc: iommu@lists.linux.dev, robin.murphy@arm.com, m.szyprowski@samsung.com
Subject: [PATCH] arch/arm/mm/dma-mapping.c: fix __alloc_from_pool returning a dirty buffer
Date: Fri, 23 Dec 2022 15:15:47 +0100	[thread overview]
Message-ID: <14dccd8c-e29a-fe93-5d4c-f0c3ff4f2430@gmail.com> (raw)


Hi, 

A small patch for __alloc_from_pool to clean the buffer before returning.
 
---
 arch/arm/mm/dma-mapping.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index c135f6e37a00..bb2bb3ab497a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -366,6 +366,7 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
 
 		*ret_page = phys_to_page(phys);
 		ptr = (void *)val;
+		memset(ptr, 0, size);
 	}
 
 	return ptr;
-- 
2.39.0


Kind regards,
Igor Klochko

             reply	other threads:[~2022-12-23 14:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-23 14:15 Igor Klochko [this message]
2022-12-23 14:39 ` [PATCH] arch/arm/mm/dma-mapping.c: fix __alloc_from_pool returning a dirty buffer Christoph Hellwig
2022-12-23 22:51   ` Igor Klochko
2022-12-23 22:51     ` Igor Klochko
2023-01-03  9:51     ` Russell King (Oracle)
2023-01-03  9:51       ` Russell King (Oracle)
2023-01-03 13:58       ` Robin Murphy
2023-01-03 13:58         ` Robin Murphy

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