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-rw-r--r--sql/item_strfunc.cc5
1 files changed, 3 insertions, 2 deletions
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index bba3799d398..e6bd969ad2f 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -2955,8 +2955,9 @@ String *Item_func_compress::val_str(String *str)
null_value= 1;
return 0;
}
-
- int4store(buffer.c_ptr(),res->length() & 0x3FFFFFFF);
+
+ char *tmp= buffer.c_ptr(); // int4store is a macro; avoid side effects
+ int4store(tmp, res->length() & 0x3FFFFFFF);
/* This is for the stupid char fields which trim ' ': */
char *last_char= ((char*)body)+new_size-1;