diff -urN ../exim-4.84.orig/src/mime.c ../exim-4.84/src/mime.c

--- ../exim-4.84.orig/src/mime.c	2014-08-09 15:44:29.000000000 +0300

+++ ../exim-4.84/src/mime.c	2014-11-12 02:36:21.000000000 +0200

@@ -620,12 +620,18 @@

 		else

 		  param_value = string_cat(param_value, &size, &ptr, q++, 1);

 		}

-	      param_value[ptr++] = '\0';

-	      param_value_len = ptr;

-

-	      param_value = rfc2047_decode(param_value, check_rfc2047_length, NULL, 32, &param_value_len, &q);

-	      debug_printf("Found %s MIME parameter in %s header, value is '%s'\n", mp->name, mime_header_list[i].name, param_value);

-	      *((uschar **)(mp->value)) = param_value;

+	      if (param_value)

+		{

+		param_value[ptr++] = '\0';

+		param_value_len = ptr;

+

+		param_value = rfc2047_decode(param_value,

+		      check_rfc2047_length, NULL, 32, &param_value_len, &q);

+		debug_printf("Found %s MIME parameter in %s header, "

+		      "value is '%s'\n", mp->name, mime_header_list[i].name,

+		      param_value);

+		}

+	      *mp->value = param_value;

 	      p += (mp->namelen + param_value_len + 1);

 	      goto NEXT_PARAM_SEARCH;

 	    }

diff -urN ../exim-4.84.orig/src/mime.h ../exim-4.84/src/mime.h

--- ../exim-4.84.orig/src/mime.h	2014-08-09 15:44:29.000000000 +0300

+++ ../exim-4.84/src/mime.h	2014-11-12 02:36:13.000000000 +0200

@@ -40,15 +40,15 @@

 typedef struct mime_parameter {

-  uschar *name;

-  int    namelen;

-  void   *value;

+  uschar *  name;

+  int       namelen;

+  uschar ** value;

 } mime_parameter;

 static mime_parameter mime_parameter_list[] = {

-  { US"name=", 5, &mime_filename },

+  { US"name=",     5, &mime_filename },

   { US"filename=", 9, &mime_filename },

-  { US"charset=", 8, &mime_charset },

+  { US"charset=",  8, &mime_charset },

   { US"boundary=", 9, &mime_boundary }

 };