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-rw-r--r--virt/kvm/kvm_main.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1f888a103f78..5ecea812cb6a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1227,9 +1227,9 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
- int as_id, id, n;
+ int as_id, id;
gfn_t offset;
- unsigned long i;
+ unsigned long i, n;
unsigned long *dirty_bitmap;
unsigned long *dirty_bitmap_buffer;
@@ -1249,6 +1249,11 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
return -ENOENT;
n = kvm_dirty_bitmap_bytes(memslot);
+
+ if (log->first_page > memslot->npages ||
+ log->num_pages > memslot->npages - log->first_page)
+ return -EINVAL;
+
*flush = false;
dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n))

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