bzr push into mysql-trunk branch (tor.didriksen:3714 to 3715) Bug#13810145

[Tor Didriksen]

 3715 Tor Didriksen	2012-03-06
      Bug#13810145 FIX WARNINGS BY FORTIFY
      
      Fortify reports lots of warnings:
      "Use After Free"
      "Double Free"
      "Memory Leak"
     @ mysys/my_lib.c
        Try to help fortify flow analysis:
        if we do my_malloc() here, we are guaranteed to do my_free() as well.
     @ sql/net_serv.cc
        Try to help fortify flow analysis:
        if we do my_malloc() here, we are guaranteed to do my_free() as well.

    modified:
      mysys/my_lib.c
      sql/net_serv.cc
 3714 Marc Alff	2012-03-05 [merge]
      Local merge

    modified:
      mysql-test/suite/rpl/r/rpl_mts_debug.result
      mysql-test/suite/rpl/t/rpl_mts_debug.test
      mysql-test/suite/sys_vars/r/slave_checkpoint_group_basic.result
      sql/rpl_rli_pdb.cc
      sql/rpl_slave.cc
      sql/rpl_slave.h
=== modified file 'mysys/my_lib.c'
--- a/mysys/my_lib.c	2011-11-28 07:13:03 +0000
+++ b/mysys/my_lib.c	2012-03-06 07:07:57 +0000
@@ -402,12 +402,12 @@ int my_fstat(File Filedes, MY_STAT *stat
 
 MY_STAT *my_stat(const char *path, MY_STAT *stat_area, myf my_flags)
 {
-  int m_used;
+  const int m_used= (stat_area == NULL);
   DBUG_ENTER("my_stat");
   DBUG_PRINT("my", ("path: '%s'  stat_area: 0x%lx  MyFlags: %d", path,
                     (long) stat_area, my_flags));
 
-  if ((m_used= (stat_area == NULL)))
+  if (m_used)
     if (!(stat_area= (MY_STAT *) my_malloc(sizeof(MY_STAT), my_flags)))
       goto error;
 #ifndef _WIN32

=== modified file 'sql/net_serv.cc'
--- a/sql/net_serv.cc	2011-11-03 16:03:34 +0000
+++ b/sql/net_serv.cc	2012-03-06 07:07:57 +0000
@@ -609,7 +609,8 @@ net_write_packet(NET *net, const uchar *
   net->reading_or_writing= 2;
 
 #ifdef HAVE_COMPRESS
-  if (net->compress)
+  const bool do_compress= net->compress;
+  if (do_compress)
   {
     if ((packet= compress_packet(net, packet, &length)) == NULL)
     {
@@ -629,7 +630,7 @@ net_write_packet(NET *net, const uchar *
   res= net_write_raw_loop(net, packet, length);
 
 #ifdef HAVE_COMPRESS
-  if (net->compress)
+  if (do_compress)
     my_free((void *) packet);
 #endif
 

No bundle (reason: useless for push emails).