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From "Robbie Gemmell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PROTON-1832) [c] duplicate link names cause invalid read in pn_transport_unbind_handles
Date Wed, 02 May 2018 10:33:00 GMT

    [ https://issues.apache.org/jira/browse/PROTON-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460843#comment-16460843
] 

Robbie Gemmell commented on PROTON-1832:
----------------------------------------

Most of the commentary for this issue can actually be found on PROTON-1831.

> [c] duplicate link names cause invalid read in pn_transport_unbind_handles
> --------------------------------------------------------------------------
>
>                 Key: PROTON-1832
>                 URL: https://issues.apache.org/jira/browse/PROTON-1832
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: proton-c-0.22.0
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>            Priority: Major
>             Fix For: proton-c-0.23.0
>
>
> Proton has an invalid read error in pn_transport_unbind_handles under specific circumstances
where the same name is used to create 2 different incoming links on the same session.
> This patch demonstrates
> {code:java}
> 1 file changed, 43 insertions(+), 2 deletions(-)
> c/tests/connection_driver.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
> modified   c/tests/connection_driver.c
> @@ -48,6 +48,24 @@ static pn_event_type_t open_handler(test_handler_t *th, pn_event_t
*e) {
>    return PN_EVENT_NONE;
>  }
>  
> +/* Like open_handler but also reply to REMOTE_CLOSE */
> +static pn_event_type_t open_close_handler(test_handler_t *th, pn_event_t *e) {
> +  switch (pn_event_type(e)) {
> +   case PN_CONNECTION_REMOTE_CLOSE:
> +    pn_connection_open(pn_event_connection(e));
> +    break;
> +   case PN_SESSION_REMOTE_CLOSE:
> +    pn_session_open(pn_event_session(e));
> +    break;
> +   case PN_LINK_REMOTE_CLOSE:
> +    pn_link_close(pn_event_link(e));
> +    break;
> +   default:
> +    return open_handler(th, e);
> +  }
> +  return PN_EVENT_NONE;
> +}
> +
>  /* Handler that returns control on PN_DELIVERY and stores the delivery on the handler
*/
>  static pn_event_type_t delivery_handler(test_handler_t *th, pn_event_t *e) {
>    switch (pn_event_type(e)) {
> @@ -442,6 +458,30 @@ static void test_session_flow_control(test_t *t) {
>    test_connection_drivers_destroy(&client, &server);
>  }
>  
> +/* Regression test for crash caused by using the same name for multiple links on same
session. */
> +static void test_duplicate_link(test_t *t) {
> +  /* Set up the initial link */
> +  test_connection_driver_t client, server;
> +  test_connection_drivers_init(t, &client, open_close_handler, &server, open_close_handler);
> +  pn_connection_open(client.driver.connection);
> +  pn_session_t *ssn = pn_session(client.driver.connection);
> +  pn_session_open(ssn);
> +  pn_link_t *x = pn_sender(ssn, "x");
> +  pn_link_open(x);
> +  /* Close the link and open a new link with same name.
> +     NOTE: close and duplicate open must be in the same batch of events
> +  */
> +  pn_link_close(x);
> +  pn_link_open(pn_sender(ssn, "x"));
> +  test_connection_drivers_run(&client, &server);
> +  /* At this point the server has 2 handle map entries for the same link.
> +     Freeing the link is correct, refcounting will keep it in memory,
> +     but the extra handle map entry will cause a core dump in pn_transport_unbind_handles
> +  */
> +  pn_link_free(server.handler.link);
> +  test_connection_drivers_destroy(&client, &server);
> +}
> +
>  int main(int argc, char **argv) {
>    int failed = 0;
>    RUN_ARGV_TEST(failed, t, test_message_transfer(&t));
> @@ -449,5 +489,6 @@ int main(int argc, char **argv) {
>    RUN_ARGV_TEST(failed, t, test_message_abort(&t));
>    RUN_ARGV_TEST(failed, t, test_message_abort_mixed(&t));
>    RUN_ARGV_TEST(failed, t, test_session_flow_control(&t));
> +  RUN_ARGV_TEST(failed, t, test_duplicate_link(&t));
>    return failed;
>  }
> {code}



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