[decompress] Fix nullptr addition & improve fuzzer #3356
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Fix an instance of `NULL + 0` in `ZSTD_decompressStream()`. Also, improve our `stream_decompress` fuzzer to pass `NULL` in/out buffers to `ZSTD_decompressStream()`, and fix 2 issues that were immediately surfaced. Fixes facebook#3351
Cyan4973
approved these changes
Dec 15, 2022
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Fix an instance of
NULL + 0inZSTD_decompressStream(). Also, improve ourstream_decompressfuzzer to passNULLin/out buffers toZSTD_decompressStream(), and fix 2 issues that were immediately surfaced.The
stream_decompressfuzzer now catches this bug when the relevant UBSAN warning is enabled.I scanned through
ZSTD_decompressStream()and this seems to be the only offending pointer arithmetic.Fixes #3351