commit 90b840af60a43eb8f8f66080ff5f53dda9df717b Author: David Goulet dgoulet@torproject.org Date: Wed May 3 09:26:17 2017 -0400

control: Fix NULL pointer access in HS desc event

This was introduced 90562fc23a7ce61f3660b507d9991a27af2eae37 adding a code path where we pass a NULL pointer for the HSDir fingerprint to the control event subsystem. The HS desc failed function wasn't handling properly that pointer for a NULL value.

Two unit tests are also added in this commit to make sure we handle properly the case of a NULL hsdir fingerprint and a NULL content as well.

Fixes #22138

Signed-off-by: David Goulet dgoulet@torproject.org --- src/or/control.c | 5 +++++ src/test/test_hs.c | 23 ++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/or/control.c b/src/or/control.c index 9b0d7c0..65d2925 100644 --- a/src/or/control.c +++ b/src/or/control.c @@ -6924,6 +6924,11 @@ get_desc_id_from_query(const rend_data_t *rend_data, const char *hsdir_fp) goto end; }

+ /* Without a directory fingerprint at this stage, we can't do much. */ + if (hsdir_fp == NULL) { + goto end; + } + /* OK, we have an onion address so now let's find which descriptor ID * is the one associated with the HSDir fingerprint. */ for (replica = 0; replica < REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS; diff --git a/src/test/test_hs.c b/src/test/test_hs.c index c3457c4..b4817a2 100644 --- a/src/test/test_hs.c +++ b/src/test/test_hs.c @@ -210,9 +210,30 @@ test_hs_desc_event(void *arg) tt_str_op(received_msg,OP_EQ, expected_msg); tor_free(received_msg);

- /* test valid content. */ + /* test no HSDir fingerprint type */ + rend_query.auth_type = REND_NO_AUTH; + control_event_hs_descriptor_failed(&rend_query.base_, NULL, + "QUERY_NO_HSDIR"); + expected_msg = "650 HS_DESC FAILED "STR_HS_ADDR" NO_AUTH " \ + "UNKNOWN REASON=QUERY_NO_HSDIR\r\n"; + tt_assert(received_msg); + tt_str_op(received_msg,OP_EQ, expected_msg); + tor_free(received_msg); + + /* Test invalid content with no HSDir fingerprint. */ char *exp_msg; control_event_hs_descriptor_content(rend_query.onion_address, + STR_HS_CONTENT_DESC_ID, NULL, NULL); + tor_asprintf(&exp_msg, "650+HS_DESC_CONTENT " STR_HS_ADDR " "\ + STR_HS_CONTENT_DESC_ID " UNKNOWN" \ + "\r\n\r\n.\r\n650 OK\r\n"); + tt_assert(received_msg); + tt_str_op(received_msg, OP_EQ, exp_msg); + tor_free(received_msg); + tor_free(exp_msg); + + /* test valid content. */ + control_event_hs_descriptor_content(rend_query.onion_address, STR_HS_CONTENT_DESC_ID, HSDIR_EXIST_ID, hs_desc_content); tor_asprintf(&exp_msg, "650+HS_DESC_CONTENT " STR_HS_ADDR " "\