[glibc] resolv: Fix some unaligned accesses in resolver [BZ #30750]

[glibc] resolv: Fix some unaligned accesses in resolver [BZ #30750]

[John David Anglin]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c8fa383f4cec9cf1c0cc8ec97903c09af10286f4

commit c8fa383f4cec9cf1c0cc8ec97903c09af10286f4
Author: John David Anglin <danglin@gcc.gnu.org>
Date:   Wed Sep 13 11:04:41 2023 +0000

    resolv: Fix some unaligned accesses in resolver [BZ #30750]
    
    Signed-off-by: John David Anglin <dave.anglin@bell.net>

Diff:
---
 resolv/res_nameinquery.c  | 3 ++-
 resolv/res_queriesmatch.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/resolv/res_nameinquery.c b/resolv/res_nameinquery.c
index 24172700e1..ca56bc9283 100644
--- a/resolv/res_nameinquery.c
+++ b/resolv/res_nameinquery.c
@@ -84,6 +84,7 @@
 
 #include <arpa/nameser.h>
 #include <resolv.h>
+#include <resolv/resolv-internal.h>
 
 /* Author: paul vixie, 29may94.  */
 int
@@ -91,7 +92,7 @@ __libc_res_nameinquery (const char *name, int type, int class,
                         const unsigned char *buf, const unsigned char *eom)
 {
   const unsigned char *cp = buf + HFIXEDSZ;
-  int qdcount = ntohs (((HEADER *) buf)->qdcount);
+  int qdcount = ntohs (((UHEADER *) buf)->qdcount);
 
   while (qdcount-- > 0)
     {
diff --git a/resolv/res_queriesmatch.c b/resolv/res_queriesmatch.c
index 13a6936c47..ba1c1d0c0c 100644
--- a/resolv/res_queriesmatch.c
+++ b/resolv/res_queriesmatch.c
@@ -83,6 +83,7 @@
  */
 
 #include <resolv.h>
+#include <resolv/resolv-internal.h>
 
 /* Author: paul vixie, 29may94.  */
 int
@@ -102,7 +103,7 @@ __libc_res_queriesmatch (const unsigned char *buf1, const unsigned char *eom1,
      order.  We can compare it with the second buffer's QDCOUNT
      value without doing this.  */
   int qdcount = ((HEADER *) buf1)->qdcount;
-  if (qdcount != ((HEADER *) buf2)->qdcount)
+  if (qdcount != ((UHEADER *) buf2)->qdcount)
     return 0;
 
   qdcount = htons (qdcount);