commit 39cfaba9e26d1ca0a9b9db3ed2c2e4ba1ff9d533 Author: Nick Mathewson nickm@torproject.org Date: Thu Apr 27 10:42:05 2017 -0400

Fix handling of "final" flag in zstd decompression

We were returning "DONE" on truncated input streams, which was not what we wanted. --- src/common/compress_zstd.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/common/compress_zstd.c b/src/common/compress_zstd.c index 9c134fd..99d05c3 100644 --- a/src/common/compress_zstd.c +++ b/src/common/compress_zstd.c @@ -316,7 +316,10 @@ tor_zstd_compress_process(tor_zstd_compress_state_t *state, return TOR_COMPRESS_BUFFER_FULL; }

- if (state->compress && finish) { + if (!finish) { + // We're not done with the input, so no need to flush. + return TOR_COMPRESS_OK; + } else if (state->compress && finish) { retval = ZSTD_endStream(state->u.compress_stream, &output);

*out = (char *)output.dst + output.pos; @@ -333,9 +336,14 @@ tor_zstd_compress_process(tor_zstd_compress_state_t *state, // epilogue. if (retval > 0) return TOR_COMPRESS_BUFFER_FULL; + + return TOR_COMPRESS_DONE; + } else { + // ZSTD_flushStream returns 0 if the frame is done, or >0 if it + // is incomplete. + return (retval == 0) ? TOR_COMPRESS_DONE : TOR_COMPRESS_OK; }

- return finish ? TOR_COMPRESS_DONE : TOR_COMPRESS_OK; #else // HAVE_ZSTD. (void)state; (void)out;