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KVM: MMU: Fix free memory accounting race in mmu_alloc_roots()
authorAvi Kivity <avi@redhat.com>
Mon, 10 May 2010 09:09:56 +0000 (12:09 +0300)
committerAvi Kivity <avi@redhat.com>
Sun, 1 Aug 2010 07:35:41 +0000 (10:35 +0300)
commitf0f5933a1626c8df7b0bfd227819c66320fb4f0f
tree7ab29539ca98bf11aa3affdfb66d1f2aa55b0214tree | snapshot
parent6d77dbfc88e37c9efd5c5dd18445cfe819ae17eacommit | diff
KVM: MMU: Fix free memory accounting race in mmu_alloc_roots()

We drop the mmu lock between freeing memory and allocating the roots; this
allows some other vcpu to sneak in and allocate memory.

While the race is benign (resulting only in temporary overallocation, not oom)
it is simple and easy to fix by moving the freeing close to the allocation.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
arch/x86/kvm/mmu.c diff | blob | history
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