linux-kernel - [PATCH 3.16 128/366] scsi: qla2xxx: Avoid double completion of abort command

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Message-ID: <lsq.1539530741.649460525@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Himanshu Madhani" <himanshu.madhani@...ium.com>,
        "Ben Hutchings" <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 3.16 128/366] scsi: qla2xxx: Avoid double completion of
 abort command

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

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

From: Ben Hutchings <ben.hutchings@...ethink.co.uk>

commit 3a9910d7b686546dcc9986e790af17e148f1c888 upstream.

qla2x00_tmf_sp_done() now deletes the timer that will run
qla2x00_tmf_iocb_timeout(), but doesn't check whether the timer already
expired.  Check the return value from del_timer() to avoid calling
complete() a second time.

Fixes: 4440e46d5db7 ("[SCSI] qla2xxx: Add IOCB Abort command asynchronous ...")
Fixes: 1514839b3664 ("scsi: qla2xxx: Fix NULL pointer crash due to active ...")
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Acked-by: Himanshu Madhani <himanshu.madhani@...ium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/qla2xxx/qla_init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -363,8 +363,8 @@ qla24xx_abort_sp_done(void *data, void *
 	srb_t *sp = (srb_t *)ptr;
 	struct srb_iocb *abt = &sp->u.iocb_cmd;
 
-	del_timer(&sp->u.iocb_cmd.timer);
-	complete(&abt->u.abt.comp);
+	if (del_timer(&sp->u.iocb_cmd.timer))
+		complete(&abt->u.abt.comp);
 }
 
 static int