3 files changed, 14 insertions, 5 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 2e9e80d938d..c717b3fe3ee 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,10 @@
 2011-01-23  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Check return values of some library calls.
+        * emacs.c (main): Check dup result.
+        * frame.c: Include <limits.h>, for INT_MIN and INT_MAX.
+        (frame_name_fnn_p): Check strtol result.
+
         * image.c (x_create_bitmap_from_xpm_data): Add cast to fix type clash
         when calling XpmCreatePixmapFromData.
 
diff --git a/src/emacs.c b/src/emacs.c
index 70dd76d3a3b..9e9989ebbc6 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -912,13 +912,12 @@ main (int argc, char **argv)
           emacs_close (0);
           emacs_close (1);
           result = emacs_open (term, O_RDWR, 0);
-          if (result < 0)
+          if (result < 0 || dup (0) < 0)
             {
               char *errstring = strerror (errno);
               fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
               exit (1);
             }
-          dup (0);
           if (! isatty (0))
             {
               fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
diff --git a/src/frame.c b/src/frame.c
index 5cbdcf15abf..e663538a840 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -23,6 +23,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <stdio.h>
 #include <ctype.h>
+#include <errno.h>
+#include <limits.h>
 #include <setjmp.h>
 #include "lisp.h"
 #include "character.h"
@@ -2149,10 +2151,13 @@ frame_name_fnn_p (char *str, EMACS_INT len)
   if (len > 1 && str[0] == 'F')
     {
       char *end_ptr;
+      long int n;
+      errno = 0;
+      n = strtol (str + 1, &end_ptr, 10);
 
-      strtol (str + 1, &end_ptr, 10);
-
-      if (end_ptr == str + len)
+      if (end_ptr == str + len
+          && INT_MIN <= n && n <= INT_MAX
+          && ((LONG_MIN < n && n < LONG_MAX) || errno != ERANGE))
         return 1;
     }
   return 0;