Date: Fri, 3 Mar 2017 10:17:16 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r314590 - stable/10/sys/vm Message-ID: <201703031017.v23AHGn2009504@repo.freebsd.org>
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Author: kib Date: Fri Mar 3 10:17:16 2017 New Revision: 314590 URL: https://svnweb.freebsd.org/changeset/base/314590 Log: MFC r314195: Properly handle possible underflow in vm_fault_prefault(). Modified: stable/10/sys/vm/vm_fault.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/vm/vm_fault.c ============================================================================== --- stable/10/sys/vm/vm_fault.c Fri Mar 3 10:02:56 2017 (r314589) +++ stable/10/sys/vm/vm_fault.c Fri Mar 3 10:17:16 2017 (r314590) @@ -1140,11 +1140,12 @@ 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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