linux-kernel - [PATCH AUTOSEL 6.6 2/4] scsi: ufs: bsg: Set bsg

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Message-Id: <20250129125757.1272713-2-sashal@kernel.org>
Date: Wed, 29 Jan 2025 07:57:55 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Guixin Liu <kanie@...ux.alibaba.com>,
	Avri Altman <avri.altman@....com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	James.Bottomley@...senPartnership.com,
	beanhuo@...ron.com,
	bvanassche@....org,
	quic_ziqichen@...cinc.com,
	linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 2/4] scsi: ufs: bsg: Set bsg_queue to NULL after removal

From: Guixin Liu <kanie@...ux.alibaba.com>

[ Upstream commit 1e95c798d8a7f70965f0f88d4657b682ff0ec75f ]

Currently, this does not cause any issues, but I believe it is necessary to
set bsg_queue to NULL after removing it to prevent potential use-after-free
(UAF) access.

Signed-off-by: Guixin Liu <kanie@...ux.alibaba.com>
Link: https://lore.kernel.org/r/20241218014214.64533-3-kanie@linux.alibaba.com
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/ufs/core/ufs_bsg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
index fec5993c66c39..a6561e73c2fb2 100644
--- a/drivers/ufs/core/ufs_bsg.c
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -216,6 +216,7 @@ void ufs_bsg_remove(struct ufs_hba *hba)
 		return;
 
 	bsg_remove_queue(hba->bsg_queue);
+	hba->bsg_queue = NULL;
 
 	device_del(bsg_dev);
 	put_device(bsg_dev);
-- 
2.39.5