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                                            PromptFuzz

Heap-buffer-overflow in pngwrite.c:856:4 in png_write_png

Here are the PoC program and PoC input: [crash_poc.tar.gz](https://github.com/glennrp/libpng/files/13784199/crash_poc.tar.gz) You can reproduce this issue by running: ``` ./poc.out triger_input ```

An infinite loop in png_read_png->..->png_write_row

@jbowler Hi, I have provided the PoC program and PoC input at: [timeout_poc.tar.gz](https://github.com/glennrp/libpng/files/13784138/timeout_poc.tar.gz) You can reproduce this issue by running: ```poc.out timeout-f74021412fba530904cddd63e3033f1527d52d76```