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Index: vm_mmap.c
===================================================================
--- vm_mmap.c
+++ vm_mmap.c
@@ -257,6 +257,9 @@
/* Adjust size for rounding (on both ends). */
size += pageoff; /* low end... */
+ /* Check for rounding up to zero. */
+ if ((vm_size_t) round_page(size) < size)
+ return (EINVAL);
size = (vm_size_t) round_page(size); /* hi end */
/* Ensure alignment is at least a page and fits in a pointer. */

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