This is a note to let you know that I've just added the patch titled
ARM: 8426/1: dma-mapping: add missing range check in dma_mmap()
to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-8426-1-dma-mapping-add-missing-range-check-in-dma_mmap.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 371f0f085f629fc0f66695f572373ca4445a67ad Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Date: Fri, 28 Aug 2015 09:41:39 +0100
Subject: ARM: 8426/1: dma-mapping: add missing range check in dma_mmap()
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
commit 371f0f085f629fc0f66695f572373ca4445a67ad upstream.
dma_mmap() function in IOMMU-based dma-mapping implementation lacked
a check for valid range of mmap parameters (offset and buffer size), what
might have caused access beyond the allocated buffer. This patch fixes
this issue.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mm/dma-mapping.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1407,12 +1407,17 @@ static int arm_iommu_mmap_attrs(struct d
unsigned long uaddr = vma->vm_start;
unsigned long usize = vma->vm_end - vma->vm_start;
struct page **pages = __iommu_get_pages(cpu_addr, attrs);
+ unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
+ unsigned long off = vma->vm_pgoff;
vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
if (!pages)
return -ENXIO;
+ if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
+ return -ENXIO;
+
do {
int ret = vm_insert_page(vma, uaddr, *pages++);
if (ret) {
Patches currently in stable-queue which might be from m.szyprowski@xxxxxxxxxxx are
queue-4.3/arm-dts-add-vbus-regulator-to-usb2-phy-nodes-on-exynos3250-exynos4210-and-exynos4412-boards.patch
queue-4.3/arm-8427-1-dma-mapping-add-support-for-offset-parameter-in-dma_mmap.patch
queue-4.3/arm-8426-1-dma-mapping-add-missing-range-check-in-dma_mmap.patch
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