vim-patch:7.4.1968 (#5949)

Problem:    Invalid memory access with "\<C-">.
Solution:   Do not recognize this as a special character. (Dominique Pelle)

1d90a5a5af

src/nvim/keymap.c

@@ -573,8 +573,10 @@ int find_special_key(const char_u **srcp, const size_t src_len, int *const modp,
         } else {
           l = 1;
         }
-        if (end - bp > l && bp[l + 1] == '>') {
+        if (end - bp > l && bp[l] != '"' && bp[l + 1] == '>') {
-          bp += l;  // anything accepted, like <C-?>
+          // Anything accepted, like <C-?>, except <C-">, because the "
+          // ends the string.
+          bp += l;
         }
       }
     }

src/nvim/testdir/test_expr.vim

@@ -92,3 +92,8 @@ endfunc
 func Test_set_reg_null_list()
   call setreg('x', v:_null_list)
 endfunc
+
+func Test_special_char()
+  " The failure is only visible using valgrind.
+  call assert_fails('echo "\<C-">')
+endfunc

src/nvim/version.c

@@ -472,7 +472,7 @@ static int included_patches[] = {
   1971,
   1970,
   // 1969 NA
-  // 1968,
+  1968,
   1967,
   1966,
   // 1965 NA