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MFC revision 1.377

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Prevent a race between vm_object_collapse() and vm_object_split() from
  causing a crash.
This commit is contained in:
alc 2007-04-04 03:15:03 +00:00
parent 2bdb850e9b
commit c0131489cf
1 changed files with 8 additions and 0 deletions
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8
sys/vm/vm_object.c
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@ -1310,6 +1310,14 @@ vm_object_split(vm_map_entry_t entry)
source = orig_object->backing_object;
if (source != NULL) {
VM_OBJECT_LOCK(source);
if ((source->flags & OBJ_DEAD) != 0) {
VM_OBJECT_UNLOCK(source);
VM_OBJECT_UNLOCK(orig_object);
VM_OBJECT_UNLOCK(new_object);
vm_object_deallocate(new_object);
VM_OBJECT_LOCK(orig_object);
return;
}
LIST_INSERT_HEAD(&source->shadow_head,
new_object, shadow_list);
source->shadow_count++;