diff --git a/mysql-test/r/type_blob.result b/mysql-test/r/type_blob.result
index 369cc0cc9c0..7a129a16de6 100644
--- a/mysql-test/r/type_blob.result
+++ b/mysql-test/r/type_blob.result
@@ -807,6 +807,7 @@ set @@sql_mode='TRADITIONAL';
 create table t1 (a text default '');
 ERROR 42000: BLOB/TEXT column 'a' can't have a default value
 set @@sql_mode='';
+drop table if exists b15776;
 create table b15776 (data blob(2147483647));
 drop table b15776;
 create table b15776 (data blob(-1));
@@ -879,9 +880,13 @@ Warnings:
 Warning	1287	'TIMESTAMP(4294967294)' is deprecated; use 'TIMESTAMP' instead
 DROP TABLE b15776;
 CREATE TABLE b15776 (a timestamp(4294967295));
-ERROR 42000: Display width out of range for column 'a' (max = 255)
+Warnings:
+Warning	1287	'TIMESTAMP(4294967295)' is deprecated; use 'TIMESTAMP' instead
+DROP TABLE b15776;
 CREATE TABLE b15776 (a timestamp(4294967296));
 ERROR 42000: Display width out of range for column 'a' (max = 4294967295)
+CREATE TABLE b15776 (a timestamp(-1));
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-1))' at line 1
 CREATE TABLE b15776 (a timestamp(-2));
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-2))' at line 1
 CREATE TABLE b15776 (a int(999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999));
diff --git a/mysql-test/t/type_blob.test b/mysql-test/t/type_blob.test
index 1bede8ff6c4..63f2cb951c1 100644
--- a/mysql-test/t/type_blob.test
+++ b/mysql-test/t/type_blob.test
@@ -528,11 +528,13 @@ CREATE TABLE b15776 (a year(-2));
 ## For timestamp, we silently rewrite widths to 14 or 19.
 CREATE TABLE b15776 (a timestamp(4294967294));
 DROP TABLE b15776;
---error ER_TOO_BIG_DISPLAYWIDTH
 CREATE TABLE b15776 (a timestamp(4294967295));
+DROP TABLE b15776;
 --error ER_TOO_BIG_DISPLAYWIDTH
 CREATE TABLE b15776 (a timestamp(4294967296));
 --error ER_PARSE_ERROR
+CREATE TABLE b15776 (a timestamp(-1));
+--error ER_PARSE_ERROR
 CREATE TABLE b15776 (a timestamp(-2));
 
 
diff --git a/sql/field.cc b/sql/field.cc
index a7a76d6c950..2b6d5235003 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -7082,6 +7082,7 @@ uint32 Field_blob::get_length(const uchar *pos)
       return (uint32) tmp;
     }
   }
+  /* When expanding this, see also MAX_FIELD_BLOBLENGTH. */
   return 0;					// Impossible
 }
 
@@ -8772,11 +8773,11 @@ bool Create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
       (fld_type_modifier & NOT_NULL_FLAG) && fld_type != MYSQL_TYPE_TIMESTAMP)
     flags|= NO_DEFAULT_VALUE_FLAG;
 
-  if (fld_length != 0)
+  if (fld_length != NULL)
   {
     errno= 0;
     length= strtoul(fld_length, NULL, 10);
-    if (errno != 0)
+    if ((errno != 0) || (length > MAX_FIELD_BLOBLENGTH))
     {
       my_error(ER_TOO_BIG_DISPLAYWIDTH, MYF(0), fld_name, MAX_FIELD_BLOBLENGTH);
       DBUG_RETURN(TRUE);
@@ -8933,7 +8934,7 @@ bool Create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
     }
     break;
   case MYSQL_TYPE_TIMESTAMP:
-    if (!fld_length)
+    if (fld_length == NULL)
     {
       /* Compressed date YYYYMMDDHHMMSS */
       length= MAX_DATETIME_COMPRESSED_WIDTH;
@@ -8942,12 +8943,21 @@ bool Create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
     {
       /*
         We support only even TIMESTAMP lengths less or equal than 14
-        and 19 as length of 4.1 compatible representation.
+        and 19 as length of 4.1 compatible representation.  Silently 
+        shrink it to MAX_DATETIME_COMPRESSED_WIDTH.
       */
-      length= ((length+1)/2)*2; /* purecov: inspected */
-      length= min(length, MAX_DATETIME_COMPRESSED_WIDTH); /* purecov: inspected */
+	  DBUG_ASSERT(MAX_DATETIME_COMPRESSED_WIDTH < UINT_MAX);
+      if (length != UINT_MAX)  /* avoid overflow; is safe because of min() */
+        length= ((length+1)/2)*2;
+      length= min(length, MAX_DATETIME_COMPRESSED_WIDTH);
     }
     flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
+    /*
+      Since we silently rewrite down to MAX_DATETIME_COMPRESSED_WIDTH bytes,
+      the parser should not raise errors unless bizzarely large. 
+     */
+    max_field_charlength= UINT_MAX;
+
     if (fld_default_value)
     {
       /* Grammar allows only NOW() value for ON UPDATE clause */
@@ -9054,7 +9064,7 @@ bool Create_field::init(THD *thd, char *fld_name, enum_field_types fld_type,
       ((length > max_field_charlength && fld_type != MYSQL_TYPE_SET &&
         fld_type != MYSQL_TYPE_ENUM &&
         (fld_type != MYSQL_TYPE_VARCHAR || fld_default_value)) ||
-       (!length &&
+       ((length == 0) &&
         fld_type != MYSQL_TYPE_STRING &&
         fld_type != MYSQL_TYPE_VARCHAR && fld_type != MYSQL_TYPE_GEOMETRY)))
   {
diff --git a/sql/unireg.h b/sql/unireg.h
index 87e0e4ac8f8..aaf7a827f5f 100644
--- a/sql/unireg.h
+++ b/sql/unireg.h
@@ -63,7 +63,7 @@
 #define MAX_MBWIDTH		3		/* Max multibyte sequence */
 #define MAX_FIELD_CHARLENGTH	255
 #define MAX_FIELD_VARCHARLENGTH	65535
-#define MAX_FIELD_BLOBLENGTH    UINT_MAX
+#define MAX_FIELD_BLOBLENGTH UINT_MAX32     /* cf field_blob::get_length() */
 #define CONVERT_IF_BIGGER_TO_BLOB 512		/* Used for CREATE ... SELECT */
 
 /* Max column width +1 */