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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: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Dāvis Mosāns 2015-08-21 07:29:22 +03:00 committed by Zefan Li
parent ede7386c3e
commit 4b7e6b747c
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/mvsas/mv_sas.c
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@ -984,6 +984,8 @@ 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))