[Bug 16099] New: crond crashes with segfault if a @reboot command is used in the config file

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=16099

            Bug ID: 16099
           Summary: crond crashes with segfault if a @reboot command is
                    used in the config file
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: t.prueckl at hainzl.at
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

The issue occurs if ENABLE_FEATURE_CROND_D is NOT set.

In that case PARSE_KEEP_COPY is set to 0. Which results in parser->data being a
nullptr.

Stacktrace
#0  skip_whitespace (s=0x0) at libbb/skip_whitespace.c:19
#1  0x0000aaaaafef12f8 in load_crontab () at miscutils/crond.c:517
#2  0x0000aaaaafef1588 in rescan_crontab_dir () at miscutils/crond.c:634
#3  0x0000aaaaafef1880 in crond_main () at miscutils/crond.c:1056
#4  0x0000aaaaafee3130 in run_applet_no_and_exit () at libbb/appletlib.c:967
#5  0x0000aaaaafee34c0 in run_applet_and_exit () at libbb/appletlib.c:986
#6  0x0000aaaaafee3550 in main (argc=<optimized out>, argv=0xffffcb7f5668) at
libbb/appletlib.c:1126

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