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scsi: mpt3sas: fix an out of bound write 

cpu_msix_table is allocated to store online cpus, but pci_irq_get_affinity
may return cpu_possible_mask which is then used to access cpu_msix_table.
That causes bad user experience.  Fix limits access to only online cpus,
I've also added an additional test to protect from an unlikely change in
cpu_online_mask.

[mkp: checkpatch]

Fixes: 1d55abc0e9 ("scsi: mpt3sas: switch to pci_alloc_irq_vectors")
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Acked-by: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tomas Henzl 2018-01-19 16:22:05 +01:00 committed by Martin K. Petersen
parent a2390348c1
commit 4a8842de8d
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -2410,8 +2410,11 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
continue;
}
for_each_cpu(cpu, mask)
for_each_cpu_and(cpu, mask, cpu_online_mask) {
if (cpu >= ioc->cpu_msix_table_sz)
break;
ioc->cpu_msix_table[cpu] = reply_q->msix_index;
}
}
return;
}