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insideTheFluxandClaude Opus 5.5
24ee45c7f8
From CodeRabbit's review of #2607: when the blocks before the first image descriptor could not be walked, check_fillable fell back to treating the whole file as pixel data and the whole screen as covered, so padding could let a large canvas through the bound. A GIF with no first frame has nothing to decode, so it is now Malformed ("no readable first frame"). The image crate's GIF decoder also stops at such files when it opens them, so this was not reachable through read_header or decode in the cases tried; the bound no longer relies on the two walks agreeing. Unit test a_gif_with_no_readable_first_frame_is_refused calls check_fillable on a GIF whose comment runs to the end of the file; the old fallback returned Ok for its 400 MP screen. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PtjHGt5gnCHXgLt4NbGorf