[PATCH] PCI: dwc: avoid OOB read in find_next_bit

[Lucas Stach <l.stach@xxxxxxxxxxxxxx>]

Find_next_bit works on a long type, which causes a OOB read on the
u32 input when used on ARM64.

Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 77db32529319..81a2139d68d6 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -78,15 +78,16 @@ static struct msi_domain_info dw_pcie_msi_domain_info = {
 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 {
 	int i, pos, irq;
-	u32 val, num_ctrls;
+	u32 num_ctrls;
 	irqreturn_t ret = IRQ_NONE;
+	unsigned long val;
 
 	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
 
 	for (i = 0; i < num_ctrls; i++) {
 		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
 					(i * MSI_REG_CTRL_BLOCK_SIZE),
-				    4, &val);
+				    4, (u32 *)&val);
 		if (!val)
 			continue;
 
-- 
2.20.1