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e630f65d03
When decoding a match tag, pglz_decompress() reads 2 bytes (or 3 for extended-length matches) from the source buffer before checking whether enough data remains. The existing bounds check (sp > srcend) occurs after the reads, so truncated compressed data that ends mid-tag causes a read past the allocated buffer. Fix by validating that sufficient source bytes are available before reading each part of the match tag. The post-read sp > srcend check is no longer needed and is removed. Found by fuzz testing with libFuzzer and AddressSanitizer. Backpatch-through: 14 |
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