This is a note to let you know that I've just added the patch titled
IB/isert: Fix possible list corruption in CMA handler
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-isert-fix-possible-list-corruption-in-cma-handler.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5e9d5adcb80f8854dfa854686de9408899726d9f
Author: Saravanan Vajravel <saravanan.vajravel@xxxxxxxxxxxx>
Date: Tue Jun 6 03:25:30 2023 -0700
IB/isert: Fix possible list corruption in CMA handler
[ Upstream commit 7651e2d6c5b359a28c2d4c904fec6608d1021ca8 ]
When ib_isert module receives connection error event, it is
releasing the isert session and removes corresponding list
node but it doesn't take appropriate mutex lock to remove
the list node. This can lead to linked list corruption
Fixes: bd3792205aae ("iser-target: Fix pending connections handling in target stack shutdown sequnce")
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
Signed-off-by: Saravanan Vajravel <saravanan.vajravel@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230606102531.162967-3-saravanan.vajravel@xxxxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index b4809d2372506..00a7303c8cc60 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -657,9 +657,13 @@ static int
isert_connect_error(struct rdma_cm_id *cma_id)
{
struct isert_conn *isert_conn = cma_id->qp->qp_context;
+ struct isert_np *isert_np = cma_id->context;
ib_drain_qp(isert_conn->qp);
+
+ mutex_lock(&isert_np->mutex);
list_del_init(&isert_conn->node);
+ mutex_unlock(&isert_np->mutex);
isert_conn->cm_id = NULL;
isert_put_conn(isert_conn);
