For the VM_PHYSSEG_DENSE case, checking the requested range to fall
into the area backed by vm_page_array wrongly compared end with vm_page_array_size. It should be adjusted by first_page index to be correct. Also, the corner and incorrect case of the requested range extending after the end of the vm_page_array was incorrectly handled by allocating the segment. Fix the comparision for the end of range and return EINVAL if the end extends beyond vm_page_array. Discussed with: royger Sponsored by: The FreeBSD Foundation MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=265100
@ -551,7 +551,9 @@ vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
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#ifdef VM_PHYSSEG_DENSE
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pi = atop(start);
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if (pi >= first_page && atop(end) < vm_page_array_size) {
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if (pi >= first_page && pi < vm_page_array_size + first_page) {
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if (atop(end) >= vm_page_array_size + first_page)
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return (EINVAL);
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fp = &vm_page_array[pi - first_page];
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malloced = FALSE;
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} else
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