Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=615523...
Commit: 61552367b2ce5e9bea6b6af670ec80aea386f34e
Parent: f29b2673d3fc7ae38ec22922e9cdc75ee37386b5
Author: Mark McLoughlin <markmc@redhat.com>
AuthorDate: Mon Dec 1 13:57:48 2008 +0000
Committer: Avi Kivity <avi@redhat.com>
CommitDate: Wed Dec 31 16:55:07 2008 +0200
KVM: add KVM_USERSPACE_IRQ_SOURCE_ID assertions
Make sure kvm_request_irq_source_id() never returns
KVM_USERSPACE_IRQ_SOURCE_ID.
Likewise, check that kvm_free_irq_source_id() never accepts
KVM_USERSPACE_IRQ_SOURCE_ID.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
virt/kvm/irq_comm.c | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index db75045..aa5d1e5 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -72,11 +72,15 @@ int kvm_request_irq_source_id(struct kvm *kvm)
unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
int irq_source_id = find_first_zero_bit(bitmap,
sizeof(kvm->arch.irq_sources_bitmap));
+
if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
- irq_source_id = -EFAULT;
- } else
- set_bit(irq_source_id, bitmap);
+ return -EFAULT;
+ }
+
+ ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
+ set_bit(irq_source_id, bitmap);
+
return irq_source_id;
}
@@ -84,7 +88,9 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
{
int i;
- if (irq_source_id <= 0 ||
+ ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
+
+ if (irq_source_id < 0 ||
irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
return;
--
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