upstream

1 files changed, 8 insertions, 33 deletions

diff --git a/src/process.c b/src/process.c
index 977cfb964e2..a8088322147 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3573,52 +3573,27 @@ format; see the description of ADDRESS in `make-network-process'.  */)
   struct ifconf ifconf;
   struct ifreq *ifreq;
   void *buf = NULL;
-  int buf_size = 512, s, i;
+  ptrdiff_t buf_size = 512;
+  int s, i;
   Lisp_Object res;
 
   s = socket (AF_INET, SOCK_STREAM, 0);
   if (s < 0)
     return Qnil;
 
-  ifconf.ifc_buf = 0;
-  ifconf.ifc_len = 0;
-  if (ioctl (s, SIOCGIFCONF, &ifconf) == 0 && ifconf.ifc_len > 0)
+  do
     {
-      ifconf.ifc_buf = xmalloc (ifconf.ifc_len);
-      if (ifconf.ifc_buf == NULL)
-        {
-          close (s);
-          return Qnil;
-        }
+      buf = xpalloc (buf, &buf_size, 1, INT_MAX, 1);
+      ifconf.ifc_buf = buf;
+      ifconf.ifc_len = buf_size;
       if (ioctl (s, SIOCGIFCONF, &ifconf))
         {
           close (s);
-          xfree (ifconf.ifc_buf);
+          xfree (buf);
           return Qnil;
         }
     }
-  else
-    do
-      {
-        buf_size *= 2;
-        buf = xrealloc (buf, buf_size);
-        if (!buf)
-          {
-            close (s);
-            return Qnil;
-          }
-
-        ifconf.ifc_buf = buf;
-        ifconf.ifc_len = buf_size;
-        if (ioctl (s, SIOCGIFCONF, &ifconf))
-          {
-            close (s);
-            xfree (buf);
-            return Qnil;
-          }
-
-      }
-    while (ifconf.ifc_len == buf_size);
+  while (ifconf.ifc_len == buf_size);
 
   close (s);