bk commit into 4.1 tree (ingo:1.2524) BUG#20719

[ingo]

Below is the list of changes that have just been committed into a local
4.1 repository of mydev. When mydev does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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ChangeSet@stripped, 2006-07-29 21:58:50+02:00, ingo@stripped +1 -0
  Bug#20719 - Reading dynamic records with write buffer could fail
  After merge fix

  myisam/mi_dynrec.c@stripped, 2006-07-29 21:58:48+02:00, ingo@stripped +3 -0
    Bug#20719 - Reading dynamic records with write buffer could fail
    After merge fix

# 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:	ingo
# Host:	chilla.local
# Root:	/home/mydev/mysql-4.1-bug20719

--- 1.38/myisam/mi_dynrec.c	2006-07-29 21:58:54 +02:00
+++ 1.39/myisam/mi_dynrec.c	2006-07-29 21:58:54 +02:00
@@ -1141,6 +1141,9 @@ int _mi_read_dynamic_record(MI_INFO *inf
     block_info.second_read= 0;
     do
     {
+      /* A corrupted table can have wrong pointers. (Bug# 19835) */
+      if (filepos == HA_OFFSET_ERROR)
+        goto panic;
       if (info->opt_flag & WRITE_CACHE_USED &&
 	  info->rec_cache.pos_in_file < filepos + MI_BLOCK_INFO_HEADER_LENGTH &&
 	  flush_io_cache(&info->rec_cache))