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s390/pci: fix out of bounds access during irq setup

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During interrupt setup we allocate interrupt vectors, walk the list of msi
descriptors, and fill in the message data. Requesting more interrupts than
supported on s390 can lead to an out of bounds access.

When we restrict the number of interrupts we should also stop walking the
msi list after all supported interrupts are handled.

Cc: stable@vger.kernel.org
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Sebastian Ott 2018-08-13 11:26:46 +02:00 committed by Heiko Carstens
parent 2395103b3f
commit 866f3576a7
1 changed files with 2 additions and 0 deletions
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arch/s390/pci/pci.c
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@ -421,6 +421,8 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
hwirq = 0;
for_each_pci_msi_entry(msi, pdev) {
rc = -EIO;
if (hwirq >= msi_vecs)
break;
irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
if (irq < 0)
return -ENOMEM;