From: Will Deacon <will.deacon@arm.com>
Date: Fri, 19 Oct 2012 13:03:32 +0000 (+0100)
Subject: virtio: 9p: correctly pass physical address to userspace for high pages
X-Git-Tag: v3.8-rc1~28^2~25
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9cdc88df8e63e81c723b82c286fc97f5d0dc325;p=pandora-kernel.git

virtio: 9p: correctly pass physical address to userspace for high pages

When using a virtio transport, the 9p net device may pass the physical
address of a kernel buffer to userspace via a scatterlist inside a
virtqueue. If the kernel buffer is mapped outside of the linear mapping
(e.g. highmem), then virt_to_page will return a bogus value and we will
populate the scatterlist with junk.

This patch uses kmap_to_page when populating the page array for a kernel
buffer.

Cc: stable@kernel.org
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

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