From cc1875ecbc3c9fb2774097e03870280c91c1e0e1 Mon Sep 17 00:00:00 2001
From: =?utf8?q?D=C4=81vis=20Mos=C4=81ns?= <davispuh@gmail.com>
Date: Fri, 21 Aug 2015 07:29:22 +0300
Subject: [PATCH] mvsas: Fix NULL pointer dereference in mvs_slot_task_free
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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@gmail.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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