* process.c (Fnetwork_interface_list): Check for overflow

in size calculation.

2 files changed, 9 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 748ccc333b2..46d2cdb82f7 100644
--- a/src/ChangeLog
+++ b/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.
diff --git a/src/process.c b/src/process.c
index 236c27e5c3a..31359a1f1f2 100644
--- a/src/process.c
+++ b/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);