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soup: Hold a ref to the pending URI during completion processing

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It was reported that in the range request handling, we called `remove_pending()`
twice (once in processing it, and once potentially in the local_error cleanup),
and this could be viewed as a use-after-free. However, right now the range
cleanup and `local_error` being set are mututally exclusive.
Further, the task object already holds a strong reference, so I observed the
refcount was 2. For both of these reasons, there is no use-after-free in
practice.

Reported-By: "Siddharth Sharma" <siddharth@redhat.com>

Closes: #774
Approved by: jlebon
This commit is contained in:
Colin Walters 2017-04-03 12:46:37 -04:00 committed by Atomic Bot
parent a0e15ecbed
commit 89d663d94a
1 changed files with 7 additions and 6 deletions
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13
src/libostree/ostree-fetcher-soup.c
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@ -1040,21 +1040,21 @@ on_request_sent (GObject *object,
gpointer user_data)
{
GTask *task = G_TASK (user_data);
OstreeFetcherPendingURI *pending;
GCancellable *cancellable;
/* Hold a ref to the pending across this function, since we remove
* it from the hash early in some cases, not in others. */
OstreeFetcherPendingURI *pending = pending_uri_ref (g_task_get_task_data (task));
GCancellable *cancellable = g_task_get_cancellable (task);
GError *local_error = NULL;
glnx_unref_object SoupMessage *msg = NULL;
pending = g_task_get_task_data (task);
cancellable = g_task_get_cancellable (task);
pending->state = OSTREE_FETCHER_STATE_COMPLETE;
pending->request_body = soup_request_send_finish ((SoupRequest*) object,
result, &local_error);
if (!pending->request_body)
goto out;
g_assert_no_error (local_error);
if (SOUP_IS_REQUEST_HTTP (object))
{
msg = soup_request_http_get_message ((SoupRequestHTTP*) object);
@ -1183,6 +1183,7 @@ on_request_sent (GObject *object,
remove_pending (pending);
}
pending_uri_unref (pending);
g_object_unref (task);
}