mshv_vtl: clear hypercall output before copyout

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mshv_vtl_hvcall_call() copies output_size bytes to userspace.

The output page is freshly allocated. Userspace chooses the copyout length.

If the hypercall writes less, the tail can contain stale page data.

Clear the copied range before issuing the hypercall.

Also check both bounce page allocations before either page is used.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>

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Yousef Alhouseen 2026-06-25 20:13:14 +02:00 • committed by Wei Liu

parent ab96bc97cd

commit b496f042e0

1 changed files with 10 additions and 0 deletions

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drivers/hv/mshv_vtl_main.c

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