fix(extmarks): don't leak memory on error (neovim#22507)

src/nvim/api/extmark.c

@@ -809,8 +809,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
  return (Integer)id;
 
 error:
- clear_virttext(&decor.virt_text);
- xfree(decor.sign_text);
+ decor_clear(&decor);
  return 0;
 }
 

src/nvim/decoration.c

@@ -112,15 +112,20 @@ void decor_remove(buf_T *buf, int row, int row2, Decoration *decor)
  decor_free(decor);
 }
 
+void decor_clear(Decoration *decor)
+{
+ clear_virttext(&decor->virt_text);
+ for (size_t i = 0; i < kv_size(decor->virt_lines); i++) {
+ clear_virttext(&kv_A(decor->virt_lines, i).line);
+ }
+ kv_destroy(decor->virt_lines);
+ xfree(decor->sign_text);
+}
+
 void decor_free(Decoration *decor)
 {
  if (decor) {
- clear_virttext(&decor->virt_text);
- for (size_t i = 0; i < kv_size(decor->virt_lines); i++) {
- clear_virttext(&kv_A(decor->virt_lines, i).line);
- }
- kv_destroy(decor->virt_lines);
- xfree(decor->sign_text);
+ decor_clear(decor);
  xfree(decor);
  }
 }

test/functional/api/extmark_spec.lua

@@ -107,6 +107,13 @@ describe('API/extmarks', function()
  eq("Invalid 'id': expected positive Integer", pcall_err(set_extmark, ns, {}, 0, 0, { end_col = 1, end_row = 1 }))
  eq("Invalid mark position: expected 2 Integer items", pcall_err(get_extmarks, ns, {}, {-1, -1}))
  eq("Invalid mark position: expected mark id Integer or 2-item Array", pcall_err(get_extmarks, ns, true, {-1, -1}))
+ -- No memory leak with virt_text, virt_lines, sign_text
+ eq("right_gravity is not a boolean", pcall_err(set_extmark, ns, marks[2], 0, 0, {
+ virt_text = {{'foo', 'Normal'}},
+ virt_lines = {{{'bar', 'Normal'}}},
+ sign_text = 'a',
+ right_gravity = 'baz',
+ }))
  end)
 
  it("can end extranges past final newline using end_col = 0", function()