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Commit 1b2ca422 authored by Borislav Petkov's avatar Borislav Petkov Committed by Gleb Natapov
Browse files

kvm, cpuid: Fix sparse warning 



We need to copy padding to kernel space first before looking at it.

Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
parent a890b6fe

arch/x86/kvm/cpuid.c

+5 −3
Original line number Diff line number Diff line
@@ -564,6 +564,7 @@ static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, 
				 __u32 num_entries, unsigned int ioctl_type)

{

	int i;

	__u32 pad[3];



	if (ioctl_type != KVM_GET_EMULATED_CPUID)

		return false;
@@ -577,9 +578,10 @@ static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, 
	 * sheds a tear.

	 */

	for (i = 0; i < num_entries; i++) {

		if (entries[i].padding[0] ||

		    entries[i].padding[1] ||

		    entries[i].padding[2])

		if (copy_from_user(pad, entries[i].padding, sizeof(pad)))

			return true;



		if (pad[0] || pad[1] || pad[2])

			return true;

	}

	return false;