* process.c (Fnetwork_interface_list): Check for overflow

in size calculation.

src/ChangeLog

@@ -1,5 +1,8 @@
 2011-07-29  Paul Eggert  <eggert@cs.ucla.edu>
 
+	* process.c (Fnetwork_interface_list): Check for overflow
+	in size calculation.
+
 	* nsterm.h (struct ns_color_table.size, struct ns_color_table.avail):
 	Now ptrdiff_t, not int.
 	* nsterm.m (ns_index_color): Use ptrdiff_t, not int, for table indexes.

src/process.c

@@ -3567,6 +3567,12 @@ format; see the description of ADDRESS in `make-network-process'.  */)
     return Qnil;
 
  again:
+  if (min (INT_MAX, min (PTRDIFF_MAX, SIZE_MAX)) / sizeof *ifreqs - 25
+      < ifaces)
+    {
+      xfree (ifreqs);
+      memory_full (SIZE_MAX);
+    }
   ifaces += 25;
   buf_size = ifaces * sizeof (ifreqs[0]);
   ifreqs = (struct ifreq *)xrealloc(ifreqs, buf_size);