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Fixed off-by-one

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This commit is contained in:
M66B 2020-01-10 08:49:54 +01:00
parent 97bf1c914e
commit 570e573f0d
1 changed files with 2 additions and 2 deletions
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4
app/src/main/jni/netguard/dns.c
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@ -136,12 +136,12 @@ void parse_dns_response(const struct arguments *args, const struct ng_session *s
char rd[INET6_ADDRSTRLEN + 1]; char rd[INET6_ADDRSTRLEN + 1];
if (qtype == DNS_QTYPE_A) { if (qtype == DNS_QTYPE_A) {
if (off + sizeof(__be32) < *datalen) if (off + sizeof(__be32) <= *datalen)
inet_ntop(AF_INET, data + off, rd, sizeof(rd)); inet_ntop(AF_INET, data + off, rd, sizeof(rd));
else else
return; return;
} else if (qclass == DNS_QCLASS_IN && qtype == DNS_QTYPE_AAAA) { } else if (qclass == DNS_QCLASS_IN && qtype == DNS_QTYPE_AAAA) {
if (off + sizeof(struct in6_addr) < *datalen) if (off + sizeof(struct in6_addr) <= *datalen)
inet_ntop(AF_INET6, data + off, rd, sizeof(rd)); inet_ntop(AF_INET6, data + off, rd, sizeof(rd));
else else
return; return;