Fixed non critical buffer overflow bug in open_binary_frm() that could cause ASSERT

Added more printing of errors to myisamchk.

mysys/mf_iocache.c:
  Write error message if failed seek.
sql/table.cc:
  Fixed buffer overflow bug:
  - It's not enough to check for mysql_version to to detect partion indicator as the version may have been updated by mysql_upgrade.
storage/myisam/ha_myisam.cc:
  Don't log same error twice.
  Don't reset log_all_errors if it's set
storage/myisam/mi_check.c:
  Fixed bug that caused repair() to not report error if called twice (as when doing retry)
  More printing of errors.
storage/myisam/sort.c:
  Set my_errno in case of out of memory errors.

mysys/mf_iocache.c

@@ -1744,7 +1744,7 @@ int my_b_flush_io_cache(IO_CACHE *info,
       */
       if (!append_cache && info->seek_not_done)
       {					/* File touched, do seek */
-	if (my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(0)) ==
+	if (my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(info->myflags & MY_WME)) ==
 	    MY_FILEPOS_ERROR)
 	{
 	  UNLOCK_APPEND_BUFFER;

sql/table.cc

@@ -989,14 +989,13 @@ static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head,
 #endif
       next_chunk+= 5 + partition_info_len;
     }
-    if (share->mysql_version >= 50110)
+    if (share->mysql_version >= 50110 && next_chunk < buff_end)
     {
       /* New auto_partitioned indicator introduced in 5.1.11 */
 #ifdef WITH_PARTITION_STORAGE_ENGINE
       share->auto_partitioned= *next_chunk;
 #endif
       next_chunk++;
-      DBUG_ASSERT(next_chunk <= buff_end);
     }
     keyinfo= share->key_info;
     for (i= 0; i < keys; i++, keyinfo++)

storage/myisam/ha_myisam.cc

@@ -99,7 +99,7 @@ static void mi_check_print_msg(HA_CHECK *param,	const char* msg_type,
 			 T_AUTO_REPAIR))
   {
     my_message(ER_NOT_KEYFILE, msgbuf, MYF(MY_WME));
-    if (thd->variables.log_warnings > 2)
+    if (thd->variables.log_warnings > 2 && ! thd->log_all_errors)
       sql_print_error("%s.%s: %s", param->db_name, param->table_name, msgbuf);
     return;
   }
@@ -1673,7 +1673,7 @@ bool ha_myisam::check_and_repair(THD *thd)
     bool save_log_all_errors;
     sql_print_warning("Recovering table: '%s'",table->s->path.str);
     save_log_all_errors= thd->log_all_errors;
-    thd->log_all_errors= (thd->variables.log_warnings > 2);
+    thd->log_all_errors|= (thd->variables.log_warnings > 2);
     if (myisam_recover_options & HA_RECOVER_FULL_BACKUP)
     {
       char buff[MY_BACKUP_NAME_EXTRA_LENGTH+1];

storage/myisam/mi_check.c

@@ -1539,6 +1539,9 @@ int mi_repair(HA_CHECK *param, register MI_INFO *info,
   got_error=1;
   new_file= -1;
   sort_param.sort_info=&sort_info;
+  param->retry_repair= 0;
+  param->warning_printed= 0;
+  param->error_printed= 0;
 
   if (!(param->testflag & T_SILENT))
   {
@@ -1683,7 +1686,7 @@ int mi_repair(HA_CHECK *param, register MI_INFO *info,
   if (rep_quick && del+sort_info.dupp != info->state->del)
   {
     mi_check_print_error(param,"Couldn't fix table with quick recovery: Found wrong number of deleted records");
-    mi_check_print_error(param,"Run recovery again without -q");
+    mi_check_print_error(param,"Run recovery again without --quick");
     got_error=1;
     param->retry_repair=1;
     param->testflag|=T_RETRY_WITHOUT_QUICK;
@@ -1914,7 +1917,7 @@ int flush_blocks(HA_CHECK *param, KEY_CACHE *key_cache, File file,
 {
   if (flush_key_blocks(key_cache, file, dirty_part_map, FLUSH_RELEASE))
   {
-    mi_check_print_error(param,"%d when trying to write bufferts",my_errno);
+    mi_check_print_error(param,"%d when trying to write buffers",my_errno);
     return(1);
   }
   if (!param->using_global_keycache)
@@ -2228,7 +2231,7 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
   MYISAM_SHARE *share=info->s;
   HA_KEYSEG *keyseg;
   ulong   *rec_per_key_part;
-  char llbuff[22];
+  char llbuff[22], llbuff2[22];
   MI_SORT_INFO sort_info;
   ulonglong UNINIT_VAR(key_map);
   DBUG_ENTER("mi_repair_by_sort");
@@ -2244,12 +2247,16 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
     printf("Data records: %s\n", llstr(start_records,llbuff));
   }
   param->testflag|=T_REP; /* for easy checking */
+  param->retry_repair= 0;
+  param->warning_printed= 0;
+  param->error_printed= 0;
 
   if (info->s->options & (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD))
     param->testflag|=T_CALC_CHECKSUM;
 
   bzero((char*)&sort_info,sizeof(sort_info));
   bzero((char *)&sort_param, sizeof(sort_param));
+
   if (!(sort_info.key_block=
 	alloc_key_blocks(param,
 			 (uint) param->sort_key_blocks,
@@ -2261,7 +2268,7 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
        init_io_cache(&info->rec_cache,info->dfile,
 		     (uint) param->write_buffer_length,
 		     WRITE_CACHE,new_header_length,1,
-		     MYF(MY_WME | MY_WAIT_IF_FULL) & param->myf_rw)))
+                     MYF((param->myf_rw & MY_WAIT_IF_FULL) | MY_WME))))
     goto err;
   sort_info.key_block_end=sort_info.key_block+param->sort_key_blocks;
   info->opt_flag|=WRITE_CACHE_USED;
@@ -2433,7 +2440,10 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
 			      (my_bool) (!(param->testflag & T_VERBOSE)),
 			      (uint) param->sort_buffer_length))
     {
-      param->retry_repair=1;
+      param->retry_repair= 1;
+      if (! param->error_printed)
+        mi_check_print_error(param, "Couldn't fix table with create_index_by_sort(). Error: %d",
+                             my_errno);
       goto err;
     }
     /* No need to calculate checksum again. */
@@ -2462,7 +2472,10 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
 	/* Don't repair if we loosed more than one row */
 	if (info->state->records+1 < start_records)
 	{
-	  info->state->records=start_records;
+          mi_check_print_error(param,
+                               "Couldn't fix table as SAFE_REPAIR was requested and we would loose too many rows. %s -> %s",
+                               llstr(start_records, llbuff), llstr(info->state->records, llbuff2));
+	  info->state->records= start_records;
 	  goto err;
 	}
       }
@@ -2492,7 +2505,7 @@ int mi_repair_by_sort(HA_CHECK *param, register MI_INFO *info,
   if (rep_quick && del+sort_info.dupp != info->state->del)
   {
     mi_check_print_error(param,"Couldn't fix table with quick recovery: Found wrong number of deleted records");
-    mi_check_print_error(param,"Run recovery again without -q");
+    mi_check_print_error(param,"Run recovery again without --quick");
     got_error=1;
     param->retry_repair=1;
     param->testflag|=T_RETRY_WITHOUT_QUICK;
@@ -2664,6 +2677,9 @@ int mi_repair_parallel(HA_CHECK *param, register MI_INFO *info,
     printf("Data records: %s\n", llstr(start_records,llbuff));
   }
   param->testflag|=T_REP; /* for easy checking */
+  param->retry_repair= 0;
+  param->warning_printed= 0;
+  param->error_printed= 0;
 
   if (info->s->options & (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD))
     param->testflag|=T_CALC_CHECKSUM;

storage/myisam/sort.c

@@ -151,6 +151,7 @@ int _create_index_by_sort(MI_SORT_PARAM *info,my_bool no_messages,
 	{
 	  mi_check_print_error(info->sort_info->param,
 			       "myisam_sort_buffer_size is too small");
+          my_errno= ENOMEM;
 	  goto err;
 	}
       }
@@ -175,7 +176,8 @@ int _create_index_by_sort(MI_SORT_PARAM *info,my_bool no_messages,
   if (memavl < MIN_SORT_BUFFER)
   {
     mi_check_print_error(info->sort_info->param,"MyISAM sort buffer too small"); /* purecov: tested */
-    goto err; /* purecov: tested */
+    my_errno= ENOMEM;                           /* purecov: tested */
+    goto err;                                   /* purecov: tested */
   }
   (*info->lock_in_memory)(info->sort_info->param);/* Everything is allocated */