[PATCH AUTOSEL 6.11 65/76] dm vdo: don't refer to dedupe_context after releasing it

Sasha Levin
2024-10-04T18:20:34Z

From: Ken Raeburn <raeburn@redhat.com>

[ Upstream commit 0808ebf2f80b962e75741a41ced372a7116f1e26 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/md/dm-vdo/dedupe.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/md/dm-vdo/dedupe.c b/drivers/md/dm-vdo/dedupe.c
index 39ac68614419f..80628ae93fbac 100644
--- 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++;
}
--
2.43.0