Manual merge.

client/mysql.cc

@@ -839,7 +839,9 @@ static int get_options(int argc, char **argv)
     opt_reconnect= 0;
     connect_flag= 0; /* Not in interactive mode */
   }
-  if (!(charset_info= get_charset_by_csname(default_charset, 
+  
+  if (strcmp(default_charset, charset_info->csname) &&
+      !(charset_info= get_charset_by_csname(default_charset, 
 					    MY_CS_PRIMARY, MYF(MY_WME))))
     exit(1);
   if (argc > 1)

client/mysqlcheck.c

@@ -311,7 +311,8 @@ static int get_options(int *argc, char ***argv)
   }
 
   /* TODO: This variable is not yet used */
-  if (!(charset_info= get_charset_by_csname(default_charset, 
+  if (strcmp(default_charset, charset_info->csname) &&
+      !(charset_info= get_charset_by_csname(default_charset, 
   					    MY_CS_PRIMARY, MYF(MY_WME))))
       exit(1);
   if (*argc > 0 && opt_alldbs)

client/mysqldump.c

@@ -536,7 +536,8 @@ static int get_options(int *argc, char ***argv)
 	    my_progname);
     return(1);
   }
-  if (!(charset_info= get_charset_by_csname(default_charset, 
+  if (strcmp(default_charset, charset_info->csname) &&
+      !(charset_info= get_charset_by_csname(default_charset, 
   					    MY_CS_PRIMARY, MYF(MY_WME))))
     exit(1);
   if ((*argc < 1 && !opt_alldbs) || (*argc > 0 && opt_alldbs))

client/mysqlimport.c

@@ -238,7 +238,8 @@ static int get_options(int *argc, char ***argv)
     fprintf(stderr, "You can't use --ignore (-i) and --replace (-r) at the same time.\n");
     return(1);
   }
-  if (!(charset_info= get_charset_by_csname(default_charset,
+  if (strcmp(default_charset, charset_info->csname) &&
+      !(charset_info= get_charset_by_csname(default_charset,
   					    MY_CS_PRIMARY, MYF(MY_WME))))
     exit(1);
   if (*argc < 2)

sql/sql_parse.cc

@@ -3845,7 +3845,23 @@ mysql_parse(THD *thd, char *inBuf, uint length)
   if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
   {
     LEX *lex=lex_start(thd, (uchar*) inBuf, length);
-    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
+    if (!yyparse((void *)thd) && ! thd->is_fatal_error &&
+        /*
+          If this is not a multiple query, ensure that it has been
+          successfully parsed until the last character. This is to prevent
+          against a wrong (too big) length passed to mysql_real_query(),
+          mysql_prepare()... which can generate garbage characters at the
+          end. If the query was initially multiple, found_colon will be false
+          only when we are in the last query; this last query had already
+          been end-spaces-stripped by alloc_query() in dispatch_command(); as
+          end spaces are the only thing we accept at the end of a query, and
+          they have been stripped already, here we can require that nothing
+          remains after parsing.
+        */
+        (thd->lex->found_colon ||
+         (char*)(thd->lex->ptr) == (thd->query+thd->query_length+1) ||
+         /* yyerror() will show the garbage chars to the user */
+         (yyerror("syntax error"), 0)))
     {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
       if (mqh_used && thd->user_connect &&

sql/sql_prepare.cc

@@ -909,7 +909,15 @@ bool mysql_stmt_prepare(THD *thd, char *packet, uint packet_length)
   lex->safe_to_cache_query= 0;
   lex->param_count= 0;
 
-  if (yyparse((void *)thd) || thd->is_fatal_error || send_prepare_results(stmt))
+  if (yyparse((void *)thd) || thd->is_fatal_error ||
+      /*
+        Check for wrong (too big) length passed to mysql_prepare() resulting in
+        garbage at the end of the query. There is a similar check in mysql_parse().
+      */
+      (!thd->lex->found_colon && 
+       (char*)(thd->lex->ptr) != (thd->query+thd->query_length+1) &&
+       /* yyerror() will show the garbage chars to the user */
+       (yyerror("syntax error"), 1)) || send_prepare_results(stmt))
     goto yyparse_err;
 
   lex_end(lex);