Bug 2075807

Description of problem:

When executing "cmx" command with no additional parameter, the command crashes, e.g.:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# /usr/bin/wbemcli cmx 'http://localhost/root/cimv2:Linux_zChannelMetric'
Segmentation fault (core dumped)
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

This is due to not verifying "xtraStr" value before parsing it:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# gdb $(which wbemcli) core
[...]
Core was generated by `/usr/bin/wbemcli cmx http://localhost/root/cimv2:Linux_zChannelMetric'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  strchr () at ../sysdeps/s390/strchr-vx.S:45
45		vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */
(gdb) bt
#0  strchr () at ../sysdeps/s390/strchr-vx.S:45
#1  0x000002aa03a85d4c in strchr (__c=46, __s=0x0) at /usr/include/string.h:214
#2  main (argc=<optimized out>, argv=<optimized out>) at main.cpp:590
(gdb) f 2
#2  main (argc=<optimized out>, argv=<optimized out>) at main.cpp:590
590	         if ((params = strchr(xtraStr, '.')))
(gdb) p xtraStr
$1 = 0x0
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

"xtraStr" is initialized with this:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
119 int main (int argc, char *argv[]) {
120    int pos, retval = 0;
121    char *cmd, *params, *endptr, *opStr=NULL,*urlStr=NULL,*xtraStr=NULL;
 :
217             if (n==0) opStr=*argv;
218             else if (n==1) urlStr=strdup(*argv);
219             else if (n==2) xtraStr=*argv;
 :
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

Here above, we don't iterate "n" initially through setting "opStr" (line 217), then "urlStr" (line 218) but we never set "xtraStr" because there is no more argument.


Version-Release number of selected component (if applicable):

sblim-wbemcli-1.6.3-15.el8


How reproducible:

Always

Steps to Reproduce:
1. Execute the command

  # /usr/bin/wbemcli cmx 'http://localhost/root/cimv2:CIM_Service'

Actual results:

Core dump

Expected results:

No core dump