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dxbjavid
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The minimum code size byte that follows the local colour table in wxGIFDecoder::LoadGIF() is only checked for <= 0. dgif() sizes ab_prefix/ab_tail with allocSize = 4096 + 1, so a value of 12 starts ab_free at 4098 and the first alphabet update at gifdecod.cpp:457 writes one entry past the end of both arrays. The existing wxASSERT(ab_free < allocSize) already flagged this in debug builds. The new wxImage::BadGIFLZWMinCodeSize test feeds a 37-byte 2x1 GIF with code size 12 to LoadFile and asserts it is rejected. Closes #26501.
Tests
This directory contains tests for the library and is mostly useful for the
library developers. See the samples subdirectory for the examples that are
more useful to the application developers using the library.
If you do work on the library itself and would like to modify an existing or
add a new test, please see docs/contributing/how-to-write-unit-tests.md for
more information.
This file also contains the instructions for running the tests if you'd just like to do it to confirm that the library works correctly.