linux-kernel - [PATCH 5.3 006/180] scsi: qla2xxx: Fix memory leak when sending I/O fails

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Message-Id: <20191216174807.180209096@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:47:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Ewan D. Milne" <emilne@...hat.com>,
        Arun Easi <aeasi@...vell.com>,
        Himanshu Madhani <hmadhani@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.3 006/180] scsi: qla2xxx: Fix memory leak when sending I/O fails

From: Arun Easi <aeasi@...vell.com>

commit 2f856d4e8c23f5ad5221f8da4a2f22d090627f19 upstream.

On heavy loads, a memory leak of the srb_t structure is observed.  This
would make the qla2xxx_srbs cache gobble up memory.

Fixes: 219d27d7147e0 ("scsi: qla2xxx: Fix race conditions in the code for aborting SCSI commands")
Cc: stable@...r.kernel.org # 5.2
Link: https://lore.kernel.org/r/20191105150657.8092-7-hmadhani@marvell.com
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Arun Easi <aeasi@...vell.com>
Signed-off-by: Himanshu Madhani <hmadhani@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_os.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -947,6 +947,8 @@ qla2xxx_queuecommand(struct Scsi_Host *h

 qc24_host_busy_free_sp:
 	sp->free(sp);
+	CMD_SP(cmd) = NULL;
+	qla2x00_rel_sp(sp);

 qc24_host_busy:
 	return SCSI_MLQUEUE_HOST_BUSY;
@@ -1036,6 +1038,8 @@ qla2xxx_mqueuecommand(struct Scsi_Host *

 qc24_host_busy_free_sp:
 	sp->free(sp);
+	CMD_SP(cmd) = NULL;
+	qla2xxx_rel_qpair_sp(sp->qpair, sp);

 qc24_host_busy:
 	return SCSI_MLQUEUE_HOST_BUSY;