>Number:         11972
>Category:       kern
>Synopsis:       ENOMEM problen at uvm_map_extract()
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 15 22:04:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     H.Saito
>Release:        1.4.3
>Organization:
>Environment:
QED-R5200
System: NetBSD vw4 1.4.3 NetBSD 1.4.3 (GENERIC.opt) #7: Tue Jan 16 13:38:49 JST 2001 saito@vw4:/user5/NetBSD-1.4.3/usr/src/sys/arch/mips/compile/GENERIC.opt mips


>Description:
I found a uninitialized variable 'kva' in uvm_io() function at sys/uvm/uvm_io.c.

Kva is referd from this program.

        error = uvm_map_extract(map, baseva, chunksz, kernel_map, &kva,
                UVM_EXTRACT_QREF | UVM_EXTRACT_CONTIG |
                UVM_EXTRACT_FIXPROT);

Dstaddr variable referd from uvm_map_extract() at sys/uvm/uvm_map.c
 is undefined.

    dstaddr = *dstaddrp;
    if (uvm_map_reserve(dstmap, len, start, &dstaddr) == FALSE)
        return(ENOMEM);

This problem fixed from NetBSD-1.5.

>How-To-Repeat:

>Fix:

--- uvm_map.c.orig	Fri Dec  1 14:38:24 2000
+++ uvm_map.c	Tue Jan 16 13:36:20 2001
@@ -1360,7 +1360,7 @@
 	 * step 1: reserve space in the target map for the extracted area
 	 */
 
-	dstaddr = *dstaddrp;
+	dstaddr = vm_map_min(dstmap);
 	if (uvm_map_reserve(dstmap, len, start, &dstaddr) == FALSE)
 		return(ENOMEM);
 	*dstaddrp = dstaddr;	/* pass address back to caller */
>Release-Note:
>Audit-Trail:
>Unformatted: