Author: kib
Date: Fri Mar 3 10:02:56 2017
New Revision: 314589
URL: https://svnweb.freebsd.org/changeset/base/314589
Log:
MFC r314195:
Properly handle possible underflow in vm_fault_prefault().
Modified:
stable/11/sys/vm/vm_fault.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/vm/vm_fault.c
==============================================================================
--- stable/11/sys/vm/vm_fault.c Fri Mar 3 08:13:45 2017 (r314588)
+++ stable/11/sys/vm/vm_fault.c Fri Mar 3 10:02:56 2017 (r314589)
@@ -1372,11 +1372,12 @@ vm_fault_prefault(const struct faultstat
entry = fs->entry;
- starta = addra - backward * PAGE_SIZE;
- if (starta < entry->start) {
+ if (addra < backward * PAGE_SIZE) {
starta = entry->start;
- } else if (starta > addra) {
- starta = 0;
+ } else {
+ starta = addra - backward * PAGE_SIZE;
+ if (starta < entry->start)
+ starta = entry->start;
}
/*
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