conf/126386: NANO_MEDIASIZE overflow

[Mark A]

>Number:         126386
>Category:       conf
>Synopsis:       NANO_MEDIASIZE overflow
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Aug 09 00:00:13 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Mark A
>Release:        FreeBSD 7.0-RELEASE-p2 i386
>Organization:
>Environment:
System: FreeBSD mail.genre121.com 7.0-RELEASE-p2 FreeBSD 7.0-RELEASE-p2 #0: Thu Jul 17 02:11:59 MDT 2008 mark at mail.genre121.com:/usr/obj/usr/src/sys/MAIL i386


        
>Description:
In /usr/src/tools/tools/nanobsd/FlashDevice.sub there are 2 lines
in question...

            NANO_MEDIASIZE=`expr 4097802240 / 512`
            NANO_MEDIASIZE=`expr 4224761856 / 512`

Those result with...

            expr 4097802240 / 512
            4194303

            expr 4224761856 / 512
            4194303

        
>How-To-Repeat:
    Include "FlashDevice Sandisk 4g" in your nanobsd configuration 
    file.
    
    Insert a few debugging print statements in nanobsd.sh where 
    NANO_MEDIASIZE is used. 

    When "/bin/sh nanobsd.sh -c nanobsd.conf" is run $NANO_MEDIASIZE 
    always prints 4194303.
    
        
>Fix:
    Use expr -e 

            expr -e 4097802240 / 512
            8003520

            expr -e 4224761856 / 512
            8251488
    
    The man page for expr also states that if EXPR_COMPAT is
    set then expr -e is used.

        
>Release-Note:
>Audit-Trail:
>Unformatted: