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PR facebook#2784 introduced a bug in the decompressor that caused some valid inputs to fail to decompress. The bitstream isn't reloaded after the 4X* loop if the number of elements remaining is small enough, causing us to read more bits than are available in the bitcontainer. This was caught by the MSAN fuzzer in OSS-Fuzz because the assembly implementation isn't used in the MSAN build. Credit to OSS-Fuzz.
Cyan4973
approved these changes
Sep 27, 2021
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PR #2784 introduced a bug in the decompressor that caused some valid
inputs to fail to decompress. The bitstream isn't reloaded after the 4X*
loop if the number of elements remaining is small enough, causing us to
read more bits than are available in the bitcontainer.
This was caught by the MSAN fuzzer in OSS-Fuzz because the assembly
implementation isn't used in the MSAN build.
Credit to OSS-Fuzz.