linux-kernel - [PATCH AUTOSEL 6.6 31/38] nvmet-fc: hold reference on hostport match

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Date: Wed,  7 Feb 2024 16:23:17 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniel Wagner <dwagner@...e.de>,
	Hannes Reinecke <hare@...e.de>,
	Christoph Hellwig <hch@....de>,
	Keith Busch <kbusch@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	james.smart@...adcom.com,
	sagi@...mberg.me,
	kch@...dia.com,
	linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 31/38] nvmet-fc: hold reference on hostport match

From: Daniel Wagner <dwagner@...e.de>

[ Upstream commit ca121a0f7515591dba0eb5532bfa7ace4dc153ce ]

The hostport data structure is shared between the association, this why
we keep track of the users via a refcount. So we should not decrement
the refcount on a match and free the hostport several times.

Reported by KASAN.

Reviewed-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Daniel Wagner <dwagner@...e.de>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/fc.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index c9ef642313c8..64c26b703860 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1069,8 +1069,6 @@ nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle)
 		/* new allocation not needed */
 		kfree(newhost);
 		newhost = match;
-		/* no new allocation - release reference */
-		nvmet_fc_tgtport_put(tgtport);
 	} else {
 		newhost->tgtport = tgtport;
 		newhost->hosthandle = hosthandle;
-- 
2.43.0