diff -ruN a/nscd/netgroupcache.c b/nscd/netgroupcache.c
--- a/nscd/netgroupcache.c	2020-02-01 20:52:50.000000000 +0900
+++ b/nscd/netgroupcache.c	2021-04-16 09:10:09.046603554 +0900
@@ -248,7 +248,7 @@
 					     : NULL);
 				    ndomain = (ndomain ? newbuf + ndomaindiff
 					       : NULL);
-				    buffer = newbuf;
+				    *tofreep = buffer = newbuf;
 				  }
 
 				nhost = memcpy (buffer + bufused,
@@ -319,7 +319,7 @@
 		    else if (status == NSS_STATUS_TRYAGAIN && e == ERANGE)
 		      {
 			buflen *= 2;
-			buffer = xrealloc (buffer, buflen);
+			*tofreep = buffer = xrealloc (buffer, buflen);
 		      }
 		    else if (status == NSS_STATUS_RETURN
 			     || status == NSS_STATUS_NOTFOUND