linux-kernel - [PATCH 3.19.y-ckt 146/155] mvsas: Fix NULL pointer dereference in mvs_slot_task

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Date:	Thu, 12 Nov 2015 15:18:20 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dāvis Mosāns <davispuh@...il.com>,
	James Bottomley <JBottomley@...n.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 146/155] mvsas: Fix NULL pointer dereference in mvs_slot_task_free

3.19.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

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

From: =?UTF-8?q?D=C4=81vis=20Mos=C4=81ns?= <davispuh@...il.com>

commit 2280521719e81919283b82902ac24058f87dfc1b upstream.

When pci_pool_alloc fails in mvs_task_prep then task->lldd_task stays
NULL but it's later used in mvs_abort_task as slot which is passed
to mvs_slot_task_free causing NULL pointer dereference.

Just return from mvs_slot_task_free when passed with NULL slot.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=101891
Signed-off-by: Dāvis Mosāns <davispuh@...il.com>
Reviewed-by: Tomas Henzl <thenzl@...hat.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: James Bottomley <JBottomley@...n.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/mvsas/mv_sas.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index 454536c..9c78074 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -887,6 +887,8 @@ static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc)
 static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task,
 			  struct mvs_slot_info *slot, u32 slot_idx)
 {
+	if (!slot)
+		return;
 	if (!slot->task)
 		return;
 	if (!sas_protocol_ata(task->task_proto))
-- 
1.9.1

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