patch 8.1.1812: reading a truncted undo file hangs Vim

Problem:    Reading a truncted undo file hangs Vim.
Solution:   Check for reading EOF. (closes #4769)

src/testdir/test_undo.vim

@@ -335,6 +335,24 @@ func Test_undofile_earlier()
   call delete('Xundofile')
 endfunc
 
+" Check that reading a truncted undo file doesn't hang.
+func Test_undofile_truncated()
+  new
+  call setline(1, 'hello')
+  set ul=100
+  wundo Xundofile
+  let contents = readfile('Xundofile', 'B')
+
+  " try several sizes
+  for size in range(20, 500, 33)
+    call writefile(contents[0:size], 'Xundofile')
+    call assert_fails('rundo Xundofile', 'E825:')
+  endfor
+
+  bwipe!
+"  call delete('Xundofile')
+endfunc
+
 " Test for undo working properly when executing commands from a register.
 " Also test this in an empty buffer.
 func Test_cmd_in_reg_undo()

src/undo.c

@@ -1317,6 +1317,12 @@ unserialize_uhp(bufinfo_T *bi, char_u *file_name)
 	int len = undo_read_byte(bi);
 	int what;
 
+	if (len == EOF)
+	{
+	    corruption_error("truncated", file_name);
+	    u_free_uhp(uhp);
+	    return NULL;
+	}
 	if (len == 0)
 	    break;
 	what = undo_read_byte(bi);

src/version.c

@@ -773,6 +773,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1812,
 /**/
     1811,
 /**/