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page_fault_process_memory_range(): fix double allocation leak

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This commit is contained in:
Balazs Gerofi
2016-09-23 08:41:05 -04:00
parent 5db6c311f4
commit cc3f6e1a4f
1 changed files with 7 additions and 5 deletions
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12
kernel/process.c
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@ -1517,7 +1517,7 @@ static int page_fault_process_memory_range(struct process_vm *vm, struct vm_rang
}
}
if (phys == NOPHYS) {
void *virt;
void *virt = NULL;
size_t npages;
retry:
@ -1556,10 +1556,12 @@ retry:
attr = arch_vrflag_to_ptattr(range->flag | memobj_flag, reason, ptep);
/*****/
if (((range->flag & VR_PRIVATE)
|| ((reason & PF_PATCH)
&& !(range->flag & VR_PROT_WRITE)))
&& (!page || page_is_in_memobj(page) || page_is_multi_mapped(page))) {
if (((range->flag & VR_PRIVATE) ||
((reason & PF_PATCH) && !(range->flag & VR_PROT_WRITE)))
&& ((!page && phys == NOPHYS) || (page &&
(page_is_in_memobj(page) ||
page_is_multi_mapped(page))))) {
if (!(attr & PTATTR_DIRTY)) {
attr &= ~PTATTR_WRITABLE;
}