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virt/kvm/assigned-dev.c: Set 'dev->irq_source_id' to '-1' after free it

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As a generic function, deassign_guest_irq() assumes it can be called
even if assign_guest_irq() is not be called successfully (which can be
triggered by ioctl from user mode, indirectly).

So for assign_guest_irq() failure process, need set 'dev->irq_source_id'
to -1 after free 'dev->irq_source_id', or deassign_guest_irq() may free
it again.

Signed-off-by: Chen Gang <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Chen Gang authored and Paolo Bonzini committed 2014-08-19 15:12:28 +02:00
1 parent 0d234daf7e
commit 30d1e0e806
1 file changed
+3 -1
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virt/kvm/assigned-dev.c
+3 -1
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@@ -526,8 +526,10 @@ static int assign_guest_irq(struct kvm *kvm,
dev->irq_requested_type |= guest_irq_type;
if (dev->ack_notifier.gsi != -1)
kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
} else
} else {
kvm_free_irq_source_id(kvm, dev->irq_source_id);
dev->irq_source_id = -1;
}
return r;
}