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A6: return FORMERR in fromwire if bits are non zero.

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oss_fuzz: Issue 24864: bind9:dns_rdata_fromwire_text_fuzzer: Overwrites-const-input in dns_rdata_fromwire_text_fuzzer
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Mark Andrews 2020-08-15 10:12:50 +10:00 committed by Ondřej Surý
parent f6d7b8c20d
commit 8452404bd7
1 changed files with 3 additions and 1 deletions
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lib/dns/rdata/in_1/a6_38.c
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@ -182,7 +182,9 @@ fromwire_in_a6(ARGS_FROMWIRE) {
return (ISC_R_UNEXPECTEDEND);
}
mask = 0xff >> (prefixlen % 8);
sr.base[0] &= mask; /* Ensure pad bits are zero. */
if ((sr.base[0] & ~mask) != 0) {
return (DNS_R_FORMERR);
}
RETERR(mem_tobuffer(target, sr.base, octets));
isc_buffer_forward(source, octets);
}