linux-kernel - [PATCH 3.2 019/153] scsi: libsas: fix memory leak in sas_smp_get_phy

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Message-ID: <lsq.1527677561.298555599@decadent.org.uk>
Date:   Wed, 30 May 2018 11:52:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "chenqilin" <chenqilin2@...wei.com>,
        "Hannes Reinecke" <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Christoph Hellwig" <hch@....de>,
        "chenxiang" <chenxiang66@...ilicon.com>,
        "Jason Yan" <yanaijie@...wei.com>,
        "John Garry" <john.garry@...wei.com>
Subject: [PATCH 3.2 019/153] scsi: libsas: fix memory leak in
 sas_smp_get_phy_events()

3.2.102-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Yan <yanaijie@...wei.com>

commit 4a491b1ab11ca0556d2fda1ff1301e862a2d44c4 upstream.

We've got a memory leak with the following producer:

while true;
do cat /sys/class/sas_phy/phy-1:0:12/invalid_dword_count >/dev/null;
done

The buffer req is allocated and not freed after we return. Fix it.

Fixes: 2908d778ab3e ("[SCSI] aic94xx: new driver")
Signed-off-by: Jason Yan <yanaijie@...wei.com>
CC: John Garry <john.garry@...wei.com>
CC: chenqilin <chenqilin2@...wei.com>
CC: chenxiang <chenxiang66@...ilicon.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/libsas/sas_expander.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -566,6 +566,7 @@ int sas_smp_get_phy_events(struct sas_ph
 	phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 
  out:
+	kfree(req);
 	kfree(resp);
 	return res;