linux-kernel - [PATCH 1/1] scsi: fnic: fix use after free

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Date:   Mon,  4 Nov 2019 23:26:22 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Satish Kharat <satishkh@...co.com>,
        Sesidhar Baddela <sebaddel@...co.com>,
        Karan Tilak Kumar <kartilak@...co.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] scsi: fnic: fix use after free

The memory chunk io_req is released by mempool_free. Accessing
io_req->start_time will result in a use after free bug. Thevariable
start_time is a backup of the timestamp. So, use start_time here to
avoid use after free.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/scsi/fnic/fnic_scsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 80608b53897b..d3986a25d9c2 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -1024,7 +1024,8 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 		atomic64_inc(&fnic_stats->io_stats.io_completions);
 
 
-	io_duration_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
+	io_duration_time = jiffies_to_msecs(jiffies) -
+						jiffies_to_msecs(start_time);
 
 	if(io_duration_time <= 10)
 		atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
-- 
2.7.4