Patch "ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check" has been added to the 4.1-stable tree

Patch "ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check

to the 4.1-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-8404-1-dma-mapping-fix-off-by-one-error-in-bitmap-size-check.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 462859aa7bbe1ac83ec4377a0a06fe60778f3f27 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Wed, 8 Jul 2015 13:21:55 +0100
Subject: ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check

From: Marek Szyprowski <m.szyprowski@samsung.com>

commit 462859aa7bbe1ac83ec4377a0a06fe60778f3f27 upstream.

nr_bitmaps member of mapping structure stores the number of already
allocated bitmaps and it is interpreted as loop iterator (it starts from
0 not from 1), so a comparison against number of possible bitmap
extensions should include this fact. This patch fixes this by changing
the extension failure condition. This issue has been introduced by
commit 4d852ef8c2544ce21ae41414099a7504c61164a0 ("arm: dma-mapping: Add
support to extend DMA IOMMU mappings").

Reported-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/mm/dma-mapping.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1953,7 +1953,7 @@ static int extend_iommu_mapping(struct d
 {
 	int next_bitmap;
 
-	if (mapping->nr_bitmaps > mapping->extensions)
+	if (mapping->nr_bitmaps >= mapping->extensions)
 		return -EINVAL;
 
 	next_bitmap = mapping->nr_bitmaps;


Patches currently in stable-queue which might be from m.szyprowski@samsung.com are

queue-4.1/arm-8404-1-dma-mapping-fix-off-by-one-error-in-bitmap-size-check.patch