diff options
| -rw-r--r-- | src/network/dns_parse.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/network/dns_parse.c b/src/network/dns_parse.c index aa0d39f3..0c7a6011 100644 --- a/src/network/dns_parse.c +++ b/src/network/dns_parse.c @@ -6,6 +6,7 @@ int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, c const unsigned char *p; int len; + if (rlen<12) return -1; if ((r[3]&15)) return 0; p = r+12; qdcount = r[4]*256 + r[5]; @@ -13,13 +14,13 @@ int __dns_parse(const unsigned char *r, int rlen, int (*callback)(void *, int, c if (qdcount+ancount > 64) return -1; while (qdcount--) { while (p-r < rlen && *p-1U < 127) p++; - if (*p>193 || (*p==193 && p[1]>254) || p>r+506) + if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6) return -1; p += 5 + !!*p; } while (ancount--) { while (p-r < rlen && *p-1U < 127) p++; - if (*p>193 || (*p==193 && p[1]>254) || p>r+506) + if (*p>193 || (*p==193 && p[1]>254) || p>r+rlen-6) return -1; p += 1 + !!*p; len = p[8]*256 + p[9]; |