code cleanup after some reasoning

libmysql/libmysql.c

@@ -941,7 +941,8 @@ static void mysql_read_default_options(struct st_mysql_options *options,
 	  options->rpl_parse= 1;
 	  break;
 	case 27:
-	  options->max_allowed_packet= atoi(opt_arg);
+          if (opt_arg)
+            options->max_allowed_packet= atoi(opt_arg);
 	  break;
 	default:
 	  DBUG_PRINT("warning",("unknown option: %s",option[0]));

myisam/ft_boolean_search.c

@@ -322,10 +322,13 @@ FT_INFO * ft_init_boolean_search(MI_INFO *info, uint keynr, byte *query,
     to alloc queue with alloc_root()
   */
   res=ftb->queue.max_elements=1+query_len/(min(ft_min_word_len,2)+1);
-  ftb->queue.root=(byte **)alloc_root(&ftb->mem_root, (res+1)*sizeof(void*));
+  if (!(ftb->queue.root=
+        (byte **)alloc_root(&ftb->mem_root, (res+1)*sizeof(void*))))
+    goto err;
   reinit_queue(& ftb->queue, res, 0, 0,
                          (int (*)(void*,byte*,byte*))FTB_WORD_cmp, 0);
-  ftbe=(FTB_EXPR *)alloc_root(&ftb->mem_root, sizeof(FTB_EXPR));
+  if (!(ftbe=(FTB_EXPR *)alloc_root(&ftb->mem_root, sizeof(FTB_EXPR))))
+    goto err;
   ftbe->weight=1;
   ftbe->flags=FTB_FLAG_YES;
   ftbe->nos=1;
@@ -343,6 +346,10 @@ FT_INFO * ft_init_boolean_search(MI_INFO *info, uint keynr, byte *query,
   if (ftb->queue.elements<2) ftb->with_scan &= ~FTB_FLAG_TRUNC;
   ftb->state=READY;
   return ftb;
+err:
+  free_root(& ftb->mem_root, MYF(0));
+  my_free((gptr)ftb,MYF(0));
+  return 0;
 }
 
 

sql/mysqld.cc

@@ -4632,14 +4632,14 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
     my_use_symdir=0;
     break;
   case (int) OPT_BIND_ADDRESS:
-    if (argument && isdigit(argument[0]))
+    if (isdigit(argument[0]))
     {
       my_bind_addr = (ulong) inet_addr(argument);
     }
     else
     {
       struct hostent *ent;
-      if (argument || argument[0])
+      if (argument[0])
 	ent=gethostbyname(argument);
       else
       {

sql/opt_range.cc

@@ -2454,7 +2454,7 @@ QUICK_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table, TABLE_REF *ref)
   if (cp_buffer_from_ref(ref))
   {
     if (thd->fatal_error)
-      return 0;					// out of memory
+      goto err;					// out of memory
     return quick;				// empty range
   }
 

sql/repl_failsafe.cc

@@ -426,7 +426,6 @@ static Slave_log_event* find_slave_event(IO_CACHE* log,
     my_snprintf(errmsg, SLAVE_ERRMSG_SIZE,
 		"Could not find slave event in log '%s'",
 		(char*)log_file_name);
-    delete ev;
     return 0;
   }
 

sql/table.cc

@@ -1100,13 +1100,12 @@ rename_file_ext(const char * from,const char * to,const char * ext)
 char *get_field(MEM_ROOT *mem, TABLE *table, uint fieldnr)
 {
   Field *field=table->field[fieldnr];
-  char buff[MAX_FIELD_WIDTH];
+  char buff[MAX_FIELD_WIDTH], *to;
   String str(buff,sizeof(buff));
   field->val_str(&str,&str);
   uint length=str.length();
-  if (!length)
+  if (!length || !(to= (char*) alloc_root(mem,length+1)))
     return NullS;
-  char *to= (char*) alloc_root(mem,length+1);
   memcpy(to,str.ptr(),(uint) length);
   to[length]=0;
   return to;