* make-docfile.c (scan_lisp_file): Add bounds checking.

1 files changed, 12 insertions, 11 deletions

diff --git a/lib-src/make-docfile.c b/lib-src/make-docfile.c
index 555a563d748..2f04f1c96f3 100644
--- a/lib-src/make-docfile.c
+++ b/lib-src/make-docfile.c
@@ -1108,24 +1108,25 @@ scan_lisp_file (const char *filename, const char *mode)
      follow the conventions of the doc strings expected by this
      function.  These conventions are automatically followed by the
      byte compiler when it produces the .elc files.  */
-  static struct {
-    const char *fn;
-    size_t fl;
-  } uncompiled[] = {
-    { "loaddefs.el", sizeof("loaddefs.el") - 1 },
-    { "loadup.el", sizeof("loadup.el") - 1 },
-    { "charprop.el", sizeof("charprop.el") - 1 }
-  };
+  static const char *const uncompiled[] =
+    {
+      "loaddefs.el",
+      "loadup.el",
+      "charprop.el"
+    };
   int i, match;
   size_t flen = strlen (filename);
 
   if (generate_globals)
     fatal ("scanning lisp file when -g specified", 0);
-  if (!strcmp (filename + flen - 3, ".el"))
+  if (flen > 3 && !strcmp (filename + flen - 3, ".el"))
     {
-      for (i = 0, match = 0; i < sizeof(uncompiled)/sizeof(uncompiled[0]); i++)
+      for (i = 0, match = 0; i < sizeof (uncompiled) / sizeof (uncompiled[0]);
+           i++)
         {
-          if (!strcmp (filename + flen - uncompiled[i].fl, uncompiled[i].fn))
+          if (strlen (uncompiled[i]) <= flen
+              && !strcmp (filename + flen - strlen (uncompiled[i]),
+                          uncompiled[i]))
             {
               match = 1;
               break;