commit 5537e1fc45b683f10b3702f00e0b1280d4a5c87a Author: Nick Mathewson nickm@torproject.org Date: Tue Jun 20 11:55:18 2017 -0400

If we successfully decompress an HTTP body, return immediately.

This prevents us from calling allowed_anonymous_connection_compression_method() on the unused guessed method (if any), and rejecting something that was already safe to use. --- changes/bug22670_03 | 6 ++++++ src/or/directory.c | 24 ++++++++++++++++++------ 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/changes/bug22670_03 b/changes/bug22670_03 new file mode 100644 index 0000000..8a7aa49 --- /dev/null +++ b/changes/bug22670_03 @@ -0,0 +1,6 @@ + o Minor bugfixes (compression): + - When decompressing an object received over an anonymous directory + connection, if we have already successfully decompressed it using an + acceptable compression method, do not reject it for looking like an + unacceptable compression method. Fixes part of bug 22670; bugfix on + 0.3.1.1-alpha. diff --git a/src/or/directory.c b/src/or/directory.c index b6121d8..ac40e54 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -2255,9 +2255,15 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp, goto done; }

- if (tor_compress_supports_method(compression)) + if (tor_compress_supports_method(compression)) { tor_uncompress(&new_body, &new_len, body, body_len, compression, !allow_partial, LOG_PROTOCOL_WARN); + if (new_body) { + /* We succeeded with the declared compression method. Great! */ + rv = 0; + goto done; + } + }

/* Okay, if that didn't work, and we think that it was compressed * differently, try that. */ @@ -2268,7 +2274,7 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp, goto done; }

- if (!new_body && tor_compress_supports_method(guessed) && + if (tor_compress_supports_method(guessed) && compression != guessed) { tor_uncompress(&new_body, &new_len, body, body_len, guessed, !allow_partial, LOG_INFO); @@ -2286,13 +2292,19 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp, rv = -1; goto done; } + + done: if (new_body) { - tor_free(*bodyp); - *bodyp = new_body; - *bodylenp = new_len; + if (rv == 0) { + /* success! */ + tor_free(*bodyp); + *bodyp = new_body; + *bodylenp = new_len; + } else { + tor_free(new_body); + } }

- done: return rv; }