[PATCH] KVM: x86: Hoist input checks in kvm_add_msr_filter()

[Siddharth Chandrasekaran <sidcha@amazon.de>]

In ioctl KVM_X86_SET_MSR_FILTER, input from user space is validated
after a memdup_user(). For invalid inputs we'd memdup and then call
kfree unnecessarily. Hoist input validation to avoid kfree altogether.

Signed-off-by: Siddharth Chandrasekaran <sidcha@amazon.de>
---
 arch/x86/kvm/x86.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ee0dc58ac3a5..15c20b31cc91 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5393,11 +5393,16 @@ static int kvm_add_msr_filter(struct kvm_x86_msr_filter *msr_filter,
 	struct msr_bitmap_range range;
 	unsigned long *bitmap = NULL;
 	size_t bitmap_size;
-	int r;
 
 	if (!user_range->nmsrs)
 		return 0;
 
+	if (user_range->flags & ~(KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE))
+		return -EINVAL;
+
+	if (!user_range->flags)
+		return -EINVAL;
+
 	bitmap_size = BITS_TO_LONGS(user_range->nmsrs) * sizeof(long);
 	if (!bitmap_size || bitmap_size > KVM_MSR_FILTER_MAX_BITMAP_SIZE)
 		return -EINVAL;
@@ -5413,24 +5418,10 @@ static int kvm_add_msr_filter(struct kvm_x86_msr_filter *msr_filter,
 		.bitmap = bitmap,
 	};
 
-	if (range.flags & ~(KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE)) {
-		r = -EINVAL;
-		goto err;
-	}
-
-	if (!range.flags) {
-		r = -EINVAL;
-		goto err;
-	}
-
-	/* Everything ok, add this range identifier. */
 	msr_filter->ranges[msr_filter->count] = range;
 	msr_filter->count++;
 
 	return 0;
-err:
-	kfree(bitmap);
-	return r;
 }
 
 static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, void __user *argp)
-- 
2.17.1




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