Merge 10.11 into 11.0

1 files changed, 19 insertions, 0 deletions

diff --git a/mysys/mulalloc.c b/mysys/mulalloc.c
index 357f9315f2b..51f8d61b574 100644
--- a/mysys/mulalloc.c
+++ b/mysys/mulalloc.c
@@ -17,6 +17,11 @@
 #include "mysys_priv.h"
 #include <stdarg.h>
 
+#ifndef DBUG_OFF
+/* Put a protected barrier after every element when using my_multi_malloc() */
+#define ALLOC_BARRIER
+#endif
+
 /*
   Malloc many pointers at the same time
   Only ptr1 can be free'd, and doing this will free all
@@ -45,6 +50,9 @@ void* my_multi_malloc(PSI_memory_key key, myf myFlags, ...)
   {
     length=va_arg(args,uint);
     tot_length+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    tot_length+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
 
@@ -58,6 +66,10 @@ void* my_multi_malloc(PSI_memory_key key, myf myFlags, ...)
     *ptr=res;
     length=va_arg(args,uint);
     res+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    TRASH_FREE(res, ALIGN_SIZE(1));
+    res+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
   DBUG_RETURN((void*) start);
@@ -89,6 +101,9 @@ void *my_multi_malloc_large(PSI_memory_key key, myf myFlags, ...)
   {
     length=va_arg(args,ulonglong);
     tot_length+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    tot_length+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
 
@@ -102,6 +117,10 @@ void *my_multi_malloc_large(PSI_memory_key key, myf myFlags, ...)
     *ptr=res;
     length=va_arg(args,ulonglong);
     res+=ALIGN_SIZE(length);
+#ifdef ALLOC_BARRIER
+    TRASH_FREE(res, ALIGN_SIZE(1));
+    res+= ALIGN_SIZE(1);
+#endif
   }
   va_end(args);
   DBUG_RETURN((void*) start);