Fix denial of service - memory corruption.

[samba.git] / lib / tevent / tevent_select.c

diff --git a/lib/tevent/tevent_select.c b/lib/tevent/tevent_select.c
index d97418991ae3e3dd8bec6edd13d7fb5a0144b0ff..890e0311c6033be92cb8b36ba573587965b3901e 100644 (file)
--- a/lib/tevent/tevent_select.c
+++ b/lib/tevent/tevent_select.c
@@ -111,6 +111,11 @@ static struct tevent_fd *select_event_add_fd(struct tevent_context *ev, TALLOC_C
                                                           struct select_event_context);
        struct tevent_fd *fde;
 
+       if (fd < 0 || fd >= FD_SETSIZE) {
+               errno = EBADF;
+               return NULL;
+       }
+
        fde = tevent_common_add_fd(ev, mem_ctx, fd, flags,
                                   handler, private_data,
                                   handler_name, location);
@@ -143,6 +148,11 @@ static int select_event_loop_select(struct select_event_context *select_ev, stru
 
        /* setup any fd events */
        for (fde = select_ev->ev->fd_events; fde; fde = fde->next) {
+               if (fde->fd < 0 || fde->fd >= FD_SETSIZE) {
+                       errno = EBADF;
+                       return -1;
+               }
+
                if (fde->flags & TEVENT_FD_READ) {
                        FD_SET(fde->fd, &r_fds);
                }