linux-kernel - [PATCH 4.16 142/161] media: vb2: Fix videobuf2 to map correct area

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Date:   Thu, 24 May 2018 11:39:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
        Takao Orito <orito.takao@...ionext.com>,
        Fumihiro ATSUMI <atsumi@...initegra.co.jp>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 142/161] media: vb2: Fix videobuf2 to map correct area

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <mhiramat@...nel.org>

[ Upstream commit d13a0139d7874a0577b5955d6eed895517d23b72 ]

Fixes vb2_vmalloc_get_userptr() to ioremap correct area.
Since the current code does ioremap the page address, if the offset > 0,
it does not do ioremap the last page and results in kernel panic.

This fixes to pass the size + offset to ioremap so that ioremap
can map correct area. Also, this uses __pfn_to_phys() to get the physical
address of given PFN.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Reported-by: Takao Orito <orito.takao@...ionext.com>
Reported-by: Fumihiro ATSUMI <atsumi@...initegra.co.jp>
Reviewed-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/common/videobuf2/videobuf2-vmalloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(str
 			if (nums[i-1] + 1 != nums[i])
 				goto fail_map;
 		buf->vaddr = (__force void *)
-				ioremap_nocache(nums[0] << PAGE_SHIFT, size);
+			ioremap_nocache(__pfn_to_phys(nums[0]), size + offset);
 	} else {
 		buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1,
 					PAGE_KERNEL);