KVM: x86: Hoist input checks in kvm_add_msr_filter()

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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>
Message-Id: <20210503122111.13775-1-sidcha@amazon.de>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Siddharth Chandrasekaran 2021-05-03 14:21:11 +02:00 • committed by Paolo Bonzini

parent 5f443e424e

commit aca352886e

1 changed files with 7 additions and 19 deletions

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arch/x86/kvm/x86.c

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