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NXT: fix fromwire bitmap checks

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(cherry picked from commit 73dd849655)
This commit is contained in:
Mark Andrews
2020-08-14 00:25:04 +10:00
parent 712d3a50df
commit f266bb2f61
1 changed files with 4 additions and 2 deletions
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lib/dns/rdata/generic/nxt_30.c
+4 -2
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@@ -134,9 +134,11 @@ fromwire_nxt(ARGS_FROMWIRE) {
RETERR(dns_name_fromwire(&name, source, dctx, options, target));
isc_buffer_activeregion(source, &sr);
if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
((sr.length > 16) || sr.base[sr.length - 1] == 0))
if (sr.length > 0 && ((sr.base[0] & 0x80) != 0 || sr.length > 16 ||
sr.base[sr.length - 1] == 0))
{
return (DNS_R_BADBITMAP);
}
RETERR(mem_tobuffer(target, sr.base, sr.length));
isc_buffer_forward(source, sr.length);
return (ISC_R_SUCCESS);