Date: Fri, 25 Mar 2011 16:38:10 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r220001 - head/sys/vm Message-ID: <201103251638.p2PGcAWa087099@svn.freebsd.org>
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Author: kib Date: Fri Mar 25 16:38:10 2011 New Revision: 220001 URL: http://svn.freebsd.org/changeset/base/220001 Log: Handle the corner case in vm_fault_quick_hold_pages(). If supplied length is zero, and user address is invalid, function might return -1, due to the truncation and rounding of the address. The callers interpret the situation as EFAULT. Instead of handling the zero length in caller, filter it in vm_fault_quick_hold_pages(). Sponsored by: The FreeBSD Foundation Reviewed by: alc Modified: head/sys/vm/vm_fault.c Modified: head/sys/vm/vm_fault.c ============================================================================== --- head/sys/vm/vm_fault.c Fri Mar 25 14:01:18 2011 (r220000) +++ head/sys/vm/vm_fault.c Fri Mar 25 16:38:10 2011 (r220001) @@ -1058,6 +1058,8 @@ vm_fault_quick_hold_pages(vm_map_t map, int count; boolean_t pmap_failed; + if (len == 0) + return (0); end = round_page(addr + len); addr = trunc_page(addr);
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