[PATCH 3.16 025/134] PCI: dwc: Fix uninitialized variable in dw_handle_msi_irq()

Ben Hutchings
2017-08-18T13:13:20Z

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 1b497e6493c49bbb55c89f53562f7f853495e90d upstream.

The bug is that "val" is unsigned long but we only initialize 32 bits of
it. Then we test "if (val)" and that might be true not because we set the
bits but because some were never initialized.

Fixes: f342d940ee0e ("PCI: exynos: Add support for MSI")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/pci/host/pcie-designware.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -158,19 +158,20 @@ static struct irq_chip dw_msi_irq_chip =
/* MSI int handler */
irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
{
- unsigned long val;
+ u32 val;
int i, pos, irq;
irqreturn_t ret = IRQ_NONE;

for (i = 0; i < MAX_MSI_CTRLS; i++) {
dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
- (u32 *)&val);
+ &val);
if (!val)
continue;

ret = IRQ_HANDLED;
pos = 0;
- while ((pos = find_next_bit(&val, 32, pos)) != 32) {
+ while ((pos = find_next_bit((unsigned long *) &val, 32,
+ pos)) != 32) {
irq = irq_find_mapping(pp->irq_domain, i * 32 + pos);
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12,
4, 1 << pos);