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From:ramil Date:January 17 2007 11:18am
Subject:bk commit into 5.1 tree (ramil:1.2386) BUG#23810
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ChangeSet@stripped, 2007-01-17 15:17:59+04:00, ramil@stripped +1 -0
  Fix for bug #23810: Server crashes on various "show status ..." commands
  We access some variable values using casts like *(long *) buff
  that may cause crashes on some platforms (e.g. solaris 64) if buff is
  not properly aligned in memory, so we cannot allocate it on the stack.
  Fix: use thd->alloc() to ensure the buff is properly aligned.

  sql/, 2007-01-17 15:17:57+04:00, ramil@stripped +8 -1
    Fix for bug #23810: Server crashes on various "show status ..." commands
      - allocate 'buff' on the thread's memory pool to ensure 
        it's properly aligned (instead of the stack).

# 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:	ramil
# Host:
# Root:	/home/ram/work/b23810/b23810.5.1

--- 1.384/sql/	2007-01-17 15:18:04 +04:00
+++ 1.385/sql/	2007-01-17 15:18:04 +04:00
@@ -2021,7 +2021,7 @@ static bool show_status_array(THD *thd, 
                               const char *prefix, TABLE *table,
                               bool ucase_names)
-  char buff[SHOW_VAR_FUNC_BUFF_SIZE], *prefix_end;
+  char *buff, *prefix_end;
   /* the variable name should not be longer than 64 characters */
   char name_buffer[64];
   int len;
@@ -2029,6 +2029,13 @@ static bool show_status_array(THD *thd, 
   SHOW_VAR tmp, *var;
+  /* 
+    As we access 'buff' not only as char* we should ensure it's aligned, 
+    as it's critical for some platforms (e.g. solaris).
+    So we cannot allocate 'buff' on the stack.
+  */
+  if (!(buff= (char*) thd->alloc(SHOW_VAR_FUNC_BUFF_SIZE)))
+    return 1;
   null_lex_str.str= 0;				// For sys_var->value_ptr()
   null_lex_str.length= 0;
bk commit into 5.1 tree (ramil:1.2386) BUG#23810ramil17 Jan