linux-kernel - [PATCH 2.6.32 30/38] [PATCH 30/38] mvsas: Fix NULL pointer dereference in mvs_slot_task

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Message-Id: <20151129214704.149939503@1wt.eu>
Date:	Mon, 30 Nov 2015 02:04:51 +0000
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	DÄvis MosÄns <davispuh@...il.com>,
	Tomas Henzl <thenzl@...hat.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	James Bottomley <JBottomley@...n.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 30/38] [PATCH 30/38] mvsas: Fix NULL pointer
 dereference in mvs_slot_task_free

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

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: DÄvis MosÄns <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: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit cc1875ecbc3c9fb2774097e03870280c91c1e0e1)

Signed-off-by: Willy Tarreau <w@....eu>
---
 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 0d21386..e4c01b5 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1035,6 +1035,8 @@ 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))
-- 
1.7.12.2.21.g234cd45.dirty



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