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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