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KVM: x86: Hoist input checks in kvm_add_msr_filter()
authorSiddharth Chandrasekaran <sidcha@amazon.de>
Mon, 3 May 2021 12:21:11 +0000 (14:21 +0200)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 7 May 2021 10:06:14 +0000 (06:06 -0400)
commitc62a0f5c45448ad264a530160b4a52dea396fe4d
tree8745e7e5fb654f4918ae5db0f335e92b7fdf29c9tree | snapshot
parenta2b42a3175d27e72f3e7e443be277c4988d1b2d7commit | diff
KVM: x86: Hoist input checks in kvm_add_msr_filter()

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>
arch/x86/kvm/x86.c diff | blob | history
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