rc_avpair_tostr() crashes on bad PW_TYPE_DATE data

[jjberry314]

If bad PW_TYPE_DATE data is received, a call to gmtime() will result in a NULL pointer. This is then passed to strftime() which then causes a crash.

I have submitted a pull request which guards against this.

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Program received signal SIGSEGV, Segmentation fault.
__strftime_internal (s=s@entry=0x7ffeefb01610 "", maxsize=maxsize@entry=256, format=format@entry=0xa831bf "%m/%d/%y %H:%M:%S", tp=0x0, tzset_called=tzset_called@entry=0x7ffeefb01510,
loc=0x7f1d33b01060 <_nl_global_locale>) at strftime_l.c:565
565 strftime_l.c: No such file or directory.
(gdb) where
#0 __strftime_internal (s=s@entry=0x7ffeefb01610 "", maxsize=maxsize@entry=256, format=format@entry=0xa831bf "%m/%d/%y %H:%M:%S", tp=0x0,
tzset_called=tzset_called@entry=0x7ffeefb01510, loc=0x7f1d33b01060 <_nl_global_locale>) at strftime_l.c:565
#1 0x00007f1d337fbe83 in __GI___strftime_l (s=s@entry=0x7ffeefb01610 "", maxsize=maxsize@entry=256, format=format@entry=0xa831bf "%m/%d/%y %H:%M:%S", tp=,
loc=) at strftime_l.c:485
#2 0x00007f1d337fa040 in __GI_strftime (s=s@entry=0x7ffeefb01610 "", maxsize=maxsize@entry=256, format=format@entry=0xa831bf "%m/%d/%y %H:%M:%S", tp=) at strftime.c:25
#3 0x0000000000a0b72f in rc_avpair_tostr (rh=rh@entry=0x2df6750, pair=pair@entry=0x2e05680, name=name@entry=0x7ffeefb015e0 "Event-Timestamp", ln=ln@entry=33,
value=value@entry=0x7ffeefb01610 "", lv=lv@entry=256) at avpair.c:807
#4 0x0000000000a0b919 in rc_avpair_log (rh=0x2df6750, pair=,
buf=0x7ffeefb01800 "User-Name", ' ' <repeats 24 times>, "= 'AH-149-44/xt-0756'\nPassword", ' ' <repeats 25 times>, "= '5245'\nNAS-Port-Id", ' ' <repeats 22 times>, "= '2'\nAcct-Session-Id", ' ' <repeats 18 times>, "= '78a1a83e-a0a6-4c9d-b25b-f283"..., buf_len=32768) at avpair.c:838

[jjberry314]

(Patch has been accepted and merged to trunk)