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-rw-r--r--resolv/res_query.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/resolv/res_query.c b/resolv/res_query.c
index a8e8d7b739..3d2f2fe3a9 100644
--- a/resolv/res_query.c
+++ b/resolv/res_query.c
@@ -224,6 +224,21 @@ __libc_res_nquery(res_state statp,
tests of HP2. */
HEADER *hp2 = answerp2 ? (HEADER *) *answerp2 : hp;
+ if (n < sizeof (HEADER) && nanswerp2 != NULL
+ && *nanswerp2 > sizeof (HEADER))
+ {
+ /* Special case of partial answer. */
+ assert (hp != hp2);
+ hp = hp2;
+ }
+ else if (nanswerp2 != NULL
+ && *nanswerp2 < sizeof (HEADER) && n > sizeof (HEADER))
+ {
+ /* Special case of partial answer. */
+ assert (hp != hp2);
+ hp2 = hp;
+ }
+
if ((hp->rcode != NOERROR || ntohs(hp->ancount) == 0)
&& (hp2->rcode != NOERROR || ntohs(hp2->ancount) == 0)) {
#ifdef DEBUG