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io: fix possible double free of task error object 

If a QIOTask has an error set and the calling code uses
qio_task_propagate_error() to steal the reference to
that Error object, the task would not clear its own
reference. This would lead to a double-free when
qio_task_free runs, if the caller had (correctly) freed
the Error object they now owned.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-01-25 11:10:53 +00:00
parent c7f1cf01b8
commit 80fb34eda0
2 changed files with 4 additions and 1 deletions
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1
io/task.c
View File

@ -157,6 +157,7 @@ bool qio_task_propagate_error(QIOTask *task,
{
if (task->err) {
error_propagate(errp, task->err);
task->err = NULL;
return true;
}

4
tests/test-io-task.c
View File

@ -127,7 +127,7 @@ static void test_task_failure(void)
g_assert(data.source == obj);
g_assert(data.err == err);
g_assert(data.freed == false);
error_free(data.err);
}
@ -238,6 +238,8 @@ static void test_task_thread_failure(void)
g_assert(data.source == obj);
g_assert(data.err != NULL);
error_free(data.err);
self = g_thread_self();
/* Make sure the test_task_thread_worker actually got