1 files changed, 53 insertions, 17 deletions

diff --git a/sql/set_var.cc b/sql/set_var.cc
index fd81dc1a867..7d9d88f0281 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -1667,6 +1667,14 @@ bool sys_var::check_set(THD *thd, set_var *var, TYPELIB *enum_names)
       strmov(buff, "NULL");
       goto err;
     }
+
+    if (!m_allow_empty_value &&
+        res->length() == 0)
+    {
+      buff[0]= 0;
+      goto err;
+    }
+
     var->save_result.ulong_value= ((ulong)
 				   find_set(enum_names, res->c_ptr(),
 					    res->length(),
@@ -1682,10 +1690,19 @@ bool sys_var::check_set(THD *thd, set_var *var, TYPELIB *enum_names)
   else
   {
     ulonglong tmp= var->value->val_int();
-   /*
-     For when the enum is made to contain 64 elements, as 1ULL<<64 is
-     undefined, we guard with a "count<64" test.
-   */
+
+    if (!m_allow_empty_value &&
+        tmp == 0)
+    {
+      buff[0]= '0';
+      buff[1]= 0;
+      goto err;
+    }
+
+    /*
+      For when the enum is made to contain 64 elements, as 1ULL<<64 is
+      undefined, we guard with a "count<64" test.
+    */
     if (unlikely((tmp >= ((ULL(1)) << enum_names->count)) &&
                  (enum_names->count < 64)))
     {
@@ -2385,32 +2402,51 @@ static int  sys_check_log_path(THD *thd,  set_var *var)
   MY_STAT f_stat;
   String str(buff, sizeof(buff), system_charset_info), *res;
   const char *log_file_str;
-      
+  size_t path_length;
+
   if (!(res= var->value->val_str(&str)))
     goto err;
 
   log_file_str= res->c_ptr();
   bzero(&f_stat, sizeof(MY_STAT));
 
-  (void) unpack_filename(path, log_file_str);
-  if (my_stat(path, &f_stat, MYF(0)))
+  path_length= unpack_filename(path, log_file_str);
+
+  if (!path_length)
   {
-    /* Check if argument is a file and we have 'write' permission */
-    if (!MY_S_ISREG(f_stat.st_mode) ||
-        !(f_stat.st_mode & MY_S_IWRITE))
-      goto err;
+    /* File name is empty. */
+
+    goto err;
   }
-  else
+
+  if (my_stat(path, &f_stat, MYF(0)))
   {
-    size_t path_length;
     /*
-      Check if directory exists and 
-      we have permission to create file & write to file
+      A file system object exists. Check if argument is a file and we have
+      'write' permission.
     */
-    (void) dirname_part(path, log_file_str, &path_length);
-    if (my_access(path, (F_OK|W_OK)))
+
+    if (!MY_S_ISREG(f_stat.st_mode) ||
+        !(f_stat.st_mode & MY_S_IWRITE))
       goto err;
+
+    return 0;
   }
+
+  /* Get dirname of the file path. */
+  (void) dirname_part(path, log_file_str, &path_length);
+
+  /* Dirname is empty if file path is relative. */
+  if (!path_length)
+    return 0;
+
+  /*
+    Check if directory exists and we have permission to create file and
+    write to file.
+  */
+  if (my_access(path, (F_OK|W_OK)))
+    goto err;
+
   return 0;
 
 err: