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For the VM_PHYSSEG_DENSE case, checking the requested range to fall

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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
This commit is contained in:
Konstantin Belousov 2014-04-29 18:42:37 +00:00
parent 06177e52c9
commit a17937bdd0
1 changed files with 3 additions and 1 deletions
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4
sys/vm/vm_phys.c
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@ -551,7 +551,9 @@ vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
#ifdef VM_PHYSSEG_DENSE
pi = atop(start);
if (pi >= first_page && atop(end) < vm_page_array_size) {
if (pi >= first_page && pi < vm_page_array_size + first_page) {
if (atop(end) >= vm_page_array_size + first_page)
return (EINVAL);
fp = &vm_page_array[pi - first_page];
malloced = FALSE;
} else