| From | Ben Hutchings <> | Date | Sun, 15 Nov 2015 01:45:45 +0000 | Subject | [PATCH 3.2 49/60] mvsas: Fix NULL pointer dereference in mvs_slot_task_free |
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3.2.73-rc1 review patch. If anyone has any objections, please let me know.
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From: Dāvis Mosāns <davispuh@gmail.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@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> --- drivers/scsi/mvsas/mv_sas.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/scsi/mvsas/mv_sas.c +++ b/drivers/scsi/mvsas/mv_sas.c @@ -991,6 +991,8 @@ static void mvs_slot_free(struct mvs_inf 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))
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