dm vdo: don't refer to dedupe_context after releasing it

Clear the dedupe_context pointer in a data_vio whenever ownership of
the context is lost, so that vdo can't examine it accidentally.

Signed-off-by: Ken Raeburn <raeburn@redhat.com>
Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

diff --git a/drivers/md/dm-vdo/dedupe.c b/drivers/md/dm-vdo/dedupe.c
index 39ac68614419fe0b2f6f427fb23ac50e54dfb6f7..80628ae93fbacc938dc98539b2239aed07b799c4 100644 (file)
--- a/drivers/md/dm-vdo/dedupe.c
+++ b/drivers/md/dm-vdo/dedupe.c
@@ -729,6 +729,7 @@ static void process_update_result(struct data_vio *agent)
            !change_context_state(context, DEDUPE_CONTEXT_COMPLETE, DEDUPE_CONTEXT_IDLE))
                return;
 
+       agent->dedupe_context = NULL;
        release_context(context);
 }
 
@@ -1648,6 +1649,7 @@ static void process_query_result(struct data_vio *agent)
 
        if (change_context_state(context, DEDUPE_CONTEXT_COMPLETE, DEDUPE_CONTEXT_IDLE)) {
                agent->is_duplicate = decode_uds_advice(context);
+               agent->dedupe_context = NULL;
                release_context(context);
        }
 }
@@ -2321,6 +2323,7 @@ static void timeout_index_operations_callback(struct vdo_completion *completion)
                 * send its requestor on its way.
                 */
                list_del_init(&context->list_entry);
+               context->requestor->dedupe_context = NULL;
                continue_data_vio(context->requestor);
                timed_out++;
        }