Code:  static int check_line_charstring(void)
 {
   char *p = line;
  while (isspace(*p))
     p++;
   return (*p == '/' || (p[0] == 'd' && p[1] == 'u' && p[2] == 'p'));
 }

Vulnerability Type: DoS Exec Code Overflow 
CWE ID: CWE-119
Summary: Buffer overflow in the set_cs_start function in t1disasm.c in t1utils before 1.39 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted font file.
Commit Message: Security fixes.

- Don't overflow the small cs_start buffer (reported by Niels
  Thykier via the debian tracker (Jakub Wilk), found with a
  fuzzer ("American fuzzy lop")).

- Cast arguments to <ctype.h> functions to unsigned char.