bk commit into 4.1 tree (svoj:1.2594) BUG#24401

[Sergey Vojtovich]

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4.1 repository of svoj. When svoj does a push these changes will
be propagated to the main repository and, within 24 hours after the
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ChangeSet@stripped, 2007-01-19 15:14:00+04:00, svoj@stripped +1 -0
  BUG#24401 - MySQL server crashes if you try to retrieve data from
              corrupted table
  
  Accessing a table with corrupted column definition results in server
  crash.
  
  This is fixed by refusing to open such tables. Affects MyISAM only.
  No test case, since it requires crashed table.

  myisam/mi_open.c@stripped, 2007-01-19 15:13:59+04:00, svoj@stripped +7 -0
    Refuse to open MyISAM table with summary columns length bigger than
    maximal possible length of packed record.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	svoj
# Host:	june.mysql.com
# Root:	/home/svoj/devel/mysql/BUG24401/mysql-4.1-engines

--- 1.89/myisam/mi_open.c	2007-01-16 18:05:36 +04:00
+++ 1.90/myisam/mi_open.c	2007-01-19 15:13:59 +04:00
@@ -435,6 +435,13 @@ MI_INFO *mi_open(const char *name, int m
       offset+=share->rec[i].length;
     }
     share->rec[i].type=(int) FIELD_LAST;	/* End marker */
+    if (offset > share->base.max_pack_length)
+    {
+      /* purecov: begin inspected */
+      my_errno= HA_ERR_CRASHED;
+      goto err;
+      /* purecov: end */
+    }
 
     if (! lock_error)
     {