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Fix OOB reads of the TGA decompression buffer
It is possible to craft TGA files which will overflow the decompression buffer, but not the image's bitmap. Therefore we also have to check for potential decompression buffer overflows. This issue had been reported by Ibrahim El-Sayed to security@libgd.org; a modified case exposing an off-by-one error of the first patch had been provided by Konrad Beckmann. This commit is an amendment to commit fb0e0cc, so we use CVE-2016-6906 as well.
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