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Subject: misc/23521: NULL pointer write in vfprintf code
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>Number:         23521
>Category:       misc
>Synopsis:       NULL pointer write in vfprintf code
>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:   Wed Dec 13 05:20:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Ludde
>Release:        4.1.1
>Organization:
>Environment:
FreeBSD matchbox.dumle.nu 4.1.1-RELEASE FreeBSD 4.1.1-RELEASE #3: Wed Dec  6 19:34:33 CET 2000     root@matchbox.dumle.nu:/usr/src/sys/compile/MATCHBOX  i386
>Description:
This code crashes because of a NULL pointer write inside the vfprintf code.
It should print the 8th argument as an integer.
printf("%8$d", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

GDB output:
0x280d49e0 in vfprintf () from /usr/lib/libc.so.4
(gdb) x/i $eip
0x280d49e0 <vfprintf+10028>:    mov    %eax,(%edx)
(gdb) info reg edx
edx            0x0      0
>How-To-Repeat:
Compile a C program with this contents:
int main() {
    printf("%8$d", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
}
and run it
>Fix:
Perhaps the memory allocation failure is at:
if (tablemax >= STATIC_ARG_TBL_SIZE) {
        *argtable = (void **)
                malloc (sizeof (void *) * (tablemax + 1));
}

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


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