NULL pointer cause crash in iniparser_getboolean.

[NotmebutWind]

when input a wired ini file ,there is a crash found.
int main (int argc, char** argv)
{
dictionary * ini ;
char * ini_name ;
char* filename = argv[1];
char* fuzzstr = {0xff,0x00};
ini = iniparser_load(filename);
if (ini!=NULL) {
int b = iniparser_getboolean(ini, fuzzstr, -1);
char* s = iniparser_getstring(ini, fuzzstr, NULL);
int i = iniparser_getint(ini, fuzzstr, -1);
double d = iniparser_getdouble(ini, fuzzstr, -1.0);
iniparser_dump(ini, stdout);
iniparser_freedict(ini);
}
}
input in .ini file:
"\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x42\x9e\x20\x4a\x09\x96\xe4\x6d\xf8\xb5\x6f\x35\x9b\xca\xc5\xd2\xa0\x39\x11\x21\x52\xd8\xcf\x6c\x52\x61\x7c\x3d\xd0\xad\xf7\x13\x4b\x17\x5d\x54\xad\x42\xc1\xa5\xf7\x30\xda\x92\xfa\xa0\x64\x9a\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\xa3\xf5\xf5\xa4\xa2\xf5\xf5\xa4\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x59\x1e\x33\x07\x0c\xc7\x54\x3f\x7e\xbc\x81\xf4\x61\xa0\xad\x71\x91\x89\x74\x48\x7a\xd9\xab\x79\xc2\xbf\x54\x61\x8a\x89\x3c\xe3\xa8\x6f\xea\xb4\x37\x3e\xf3\xb5\xfa\x74\xa9\x5b\x14\x56\xcd\xa5\xdf\x41\xee\x5a\x1a\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x1f\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d\x0a\x0a\x5b\x5d"

compile:
gcc -fsantize=address test.c ./src/iniparser.c ./src/dictionary.c -o testdemo -I ./src/

run and find a crash:

==2145962==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x556d37d6dce3 bp 0x7ffedb8fc080 sp 0x7ffedb8fc040 T0)
==2145962==The signal is caused by a READ memory access.
==2145962==Hint: address points to the zero page.
#0 0x556d37d6dce3 in iniparser_getboolean ../src/iniparser.c:559
#1 0x556d37d69f57 in main /opt1/software/newtest/iniparser/test.c:19

the vuln is in function "iniparser_getboolean" miss check for function "iniparser_getstring" 's return. when iniparser_getstring return NULL, the code in 559 will cause crash .

[NotmebutWind]

also same problem in iniparser_getlongint and iniparser_getdouble which also use iniparser_getstring.