tree db52a74df7a5345f42250b7e82fb8f790820aab9
parent f0263d2d222e9e25f2587e51a9dc58c6fb2a9352
author Will Deacon <will.deacon@arm.com> 1350651812 +0100
committer Rusty Russell <rusty@rustcorp.com.au> 1350892176 +1030

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>