From 7412db5e565e50db0df1b4208de4e7999c59bf56 Mon Sep 17 00:00:00 2001
From: "svoj@april.(none)" <>
Date: Thu, 13 Apr 2006 14:37:03 +0500
Subject: [PATCH] BUG#17917 - SELECT from compressed MyISAM table crashes MySQL
 server

Retrieving data from compressed MyISAM table which is bigger than 4G on 32-bit box
with mmap() support results in server crash.

mmap() accepts length of bytes to be mapped in second param, which is 32-bit
size_t. But we pass data_file_length, which is 64-bit my_off_t. As a result only
first data_file_length % 4G were mapped.

This fix adds additional condition for mmap() usage, that is use mmap() for
compressed table which size is no more than 4G on 32-bit platform.
---
 myisam/mi_packrec.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/myisam/mi_packrec.c b/myisam/mi_packrec.c
index 322420b71db..bd2d162d100 100644
--- a/myisam/mi_packrec.c
+++ b/myisam/mi_packrec.c
@@ -1158,16 +1158,22 @@ my_bool _mi_memmap_file(MI_INFO *info)
   MYISAM_SHARE *share=info->s;
   DBUG_ENTER("mi_memmap_file");
 
-  if (!info->s->file_map)
+  if (!share->file_map)
   {
+    my_off_t data_file_length= share->state.state.data_file_length;
+    if (data_file_length > (my_off_t) (~((size_t) 0)) - MEMMAP_EXTRA_MARGIN)
+    {
+      DBUG_PRINT("warning", ("File is too large for mmap"));
+      DBUG_RETURN(0);
+    }
     if (my_seek(info->dfile,0L,MY_SEEK_END,MYF(0)) <
-	share->state.state.data_file_length+MEMMAP_EXTRA_MARGIN)
+        data_file_length + MEMMAP_EXTRA_MARGIN)
     {
       DBUG_PRINT("warning",("File isn't extended for memmap"));
       DBUG_RETURN(0);
     }
     file_map=(byte*)
-      mmap(0,share->state.state.data_file_length+MEMMAP_EXTRA_MARGIN,PROT_READ,
+      mmap(0, data_file_length + MEMMAP_EXTRA_MARGIN, PROT_READ,
 	   MAP_SHARED | MAP_NORESERVE,info->dfile,0L);
     if (file_map == (byte*) MAP_FAILED)
     {
@@ -1175,7 +1181,7 @@ my_bool _mi_memmap_file(MI_INFO *info)
       my_errno=errno;
       DBUG_RETURN(0);
     }
-    info->s->file_map=file_map;
+    share->file_map= file_map;
   }
   info->opt_flag|= MEMMAP_USED;
   info->read_record=share->read_record=_mi_read_mempack_record;