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Add tests for graphics protocol crash fixes (commits e9661f0 and 48ab623)

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Co-authored-by: kovidgoyal <1308621+kovidgoyal@users.noreply.github.com>
Agent-Logs-Url: https://github.com/kovidgoyal/kitty/sessions/52901924-cb01-416f-8d4c-56bc2872a3c6
This commit is contained in:
copilot-swe-agent[bot] 2026-03-23 03:39:38 +00:00
parent 503e0a8acf
commit b252524def
1 changed files with 18 additions and 0 deletions
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18
kitty_tests/graphics.py
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@ -512,6 +512,15 @@ class TestGraphics(BaseTest):
sl(png_data, f=100, expecting_data=expected)
# test error handling for loading bad png data
self.assertRaisesRegex(ValueError, '[EBADPNG]', load_png_data, b'dsfsdfsfsfd')
# Test that a large PNG chunk sent via direct transmission doesn't crash
# when its size exceeds 2 * initial_buf_capacity. Without the fix in
# commit 48ab623, the buffer reallocation used MIN(2*buf_capacity, MAX_DATA_SZ)
# which could leave buf_capacity smaller than the payload size, causing a
# heap buffer overflow when the data was copied in.
# Initial buf_capacity for PNG without an explicit S= is 10, so 2*10=20;
# a 25-byte chunk previously caused a crash.
res = pl(b'x' * 25, f=100)
self.ae(res.partition(':')[0], 'EBADPNG')
def test_gr_operations_with_numbers(self):
s = self.create_screen()
@ -1263,6 +1272,15 @@ class TestGraphics(BaseTest):
{'gap': 40, 'id': 2, 'data': b'abcdefghijkl'*3},
{'gap': 40, 'id': 3, 'data': b'3' * 12 + (b'333abc' + b'3' * 6) * 2},
))
# Test that compose commands with offset values that would overflow a 32-bit
# unsigned integer are correctly rejected with EINVAL instead of crashing.
# In the old code, UINT32_MAX + img->width wrapped around as uint32_t to a
# small value that bypassed the bounds check, causing a crash (fix: e9661f0).
for offset_param in ('x', 'y', 'X', 'Y'):
self.assertEqual(
li(payload=b'', a='c', i=1, r=1, c=2, s=0, v=0, f=0, **{offset_param: 0xFFFFFFFF}).code,
'EINVAL', f'Expected EINVAL for overflow in compose offset parameter {offset_param!r}'
)
def test_graphics_quota_enforcement(self):
s = self.create_screen()