Fix memory allocation and release problems in the bfd documentation processor.

	* doc/chew.c (add_to_definition): Use correct type when
	calculating size of array reallocation.
	(nextword): Always initialise the word return parameter.
	(compile): Check return value of nextword().

2 files changed, 25 insertions, 6 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 78cbd51..3fcc985 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2019-11-05  Tim Rühsen  <tim.ruehsen@gmx.de>
+
+	* doc/chew.c (add_to_definition): Use correct type when
+	calculating size of array reallocation.
+	(nextword): Always initialise the word return parameter.
+	(compile): Check return value of nextword().
+
 2019-10-30  Keith Seitz  <keiths@redhat.com>
 
 	* elf-bfd.h (elf_backend_data) <elf_backend_core_find_build_id>:
diff --git a/bfd/doc/chew.c b/bfd/doc/chew.c
index ef5a22c..d436da6 100644
--- a/bfd/doc/chew.c
+++ b/bfd/doc/chew.c
@@ -1167,7 +1167,10 @@ nextword (string, word)
 	}
     }
   if (!*string)
-    return 0;
+    {
+      *word = NULL;
+      return NULL;
+    }
 
   word_start = string;
   if (*string == '"')
@@ -1225,7 +1228,7 @@ nextword (string, word)
   if (*string)
     return string + 1;
   else
-    return 0;
+    return NULL;
 }
 
 dict_type *root;
@@ -1243,7 +1246,7 @@ lookup_word (word)
     }
   if (warning)
     fprintf (stderr, "Can't find %s\n", word);
-  return 0;
+  return NULL;
 }
 
 static void
@@ -1276,7 +1279,7 @@ free_words (void)
 }
 
 static void
-perform ()
+perform (void)
 {
   tos = stack;
 
@@ -1333,7 +1336,7 @@ add_to_definition (entry, word)
       entry->code_length += 2;
       entry->code =
 	(stinst_type *) realloc ((char *) (entry->code),
-				 entry->code_length * sizeof (word_type));
+				 entry->code_length * sizeof (stinst_type));
     }
   entry->code[entry->code_end] = word;
 
@@ -1374,6 +1377,8 @@ compile (string)
 	{
 	  free (word);
 	  string = nextword (string, &word);
+	  if (!string)
+	    continue;
 	  add_var (word);
 	  string = nextword (string, &word);
 	}
@@ -1384,8 +1389,16 @@ compile (string)
 	  /* Compile a word and add to dictionary.  */
 	  free (word);
 	  string = nextword (string, &word);
+	  if (!string)
+	    continue;
 	  ptr = newentry (word);
 	  string = nextword (string, &word);
+	  if (!string)
+	    {
+	      free (ptr->code);
+	      free (ptr);
+	      continue;
+	    }
 	  
 	  while (word[0] != ';')
 	    {
@@ -1423,7 +1436,6 @@ compile (string)
 	    }
 	  add_to_definition (ptr, 0);
 	  free (word);
-	  word = NULL;
 	  string = nextword (string, &word);
 	}
       else