(res_send): Check for overflow in descriptor set.

diff --git a/resolv/res_send.c b/resolv/res_send.c
index 60d8ef2..cde6a84 100644 (file)
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -601,6 +601,11 @@ read_len:
                        if ((long) timeout.tv_sec <= 0)
                                timeout.tv_sec = 1;
                        timeout.tv_usec = 0;
+                       if (s+1 > FD_SETSIZE) {
+                               Perror(stderr, "s+1 > FD_SETSIZE", EMFILE);
+                               res_close();
+                               goto next_ns;
+                       }
     wait:
                        FD_ZERO(&dsmask);
                        FD_SET(s, &dsmask);