From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Lv Yunlong" <lyl2019@mail.ustc.edu.cn>,
"Kai Mäkisara" <kai.makisara@kolumbus.fi>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
"Sasha Levin" <sashal@kernel.org>,
linux-scsi@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 06/10] scsi: st: Fix a use after free in st_open()
Date: Thu, 25 Mar 2021 07:28:27 -0400 [thread overview]
Message-ID: <20210325112832.1928898-6-sashal@kernel.org> (raw)
In-Reply-To: <20210325112832.1928898-1-sashal@kernel.org>
From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
[ Upstream commit c8c165dea4c8f5ad67b1240861e4f6c5395fa4ac ]
In st_open(), if STp->in_use is true, STp will be freed by
scsi_tape_put(). However, STp is still used by DEBC_printk() after. It is
better to DEBC_printk() before scsi_tape_put().
Link: https://lore.kernel.org/r/20210311064636.10522-1-lyl2019@mail.ustc.edu.cn
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/st.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 088a68ab4246..3a3876091a9d 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -1267,8 +1267,8 @@ static int st_open(struct inode *inode, struct file *filp)
spin_lock(&st_use_lock);
if (STp->in_use) {
spin_unlock(&st_use_lock);
- scsi_tape_put(STp);
DEBC_printk(STp, "Device already in use.\n");
+ scsi_tape_put(STp);
return (-EBUSY);
}
--
2.30.1
next prev parent reply other threads:[~2021-03-25 11:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 11:28 [PATCH AUTOSEL 4.4 01/10] ext4: fix bh ref count on error paths Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 02/10] rpc: fix NULL dereference on kmalloc failure Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 03/10] ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 04/10] ASoC: rt5651: " Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 05/10] ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe Sasha Levin
2021-03-25 11:28 ` Sasha Levin [this message]
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 07/10] scsi: qla2xxx: Fix broken #endif placement Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 08/10] staging: comedi: cb_pcidas: fix request_irq() warn Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 09/10] staging: comedi: cb_pcidas64: " Sasha Levin
2021-03-25 11:28 ` [PATCH AUTOSEL 4.4 10/10] ext4: do not iput inode under running transaction in ext4_rename() Sasha Levin
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