From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx> of_irq_parse_one() may use uninitialized variable @addr_len as shown below: // @addr_len is uninitialized int addr_len; // This operation does not touch @addr_len if it fails. addr = of_get_property(device, "reg", &addr_len); // Use uninitialized @addr_len if the operation fails. if (addr_len > sizeof(addr_buf)) addr_len = sizeof(addr_buf); // Check the operation result here. if (addr) memcpy(addr_buf, addr, addr_len); Fix by initializing @addr_len before the operation. Fixes: b739dffa5d57 ("of/irq: Prevent device address out-of-bounds read in interrupt map walk") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx> --- drivers/of/irq.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/of/irq.c b/drivers/of/irq.c index cb39624a5e7799b9d2f4525f42dac4cd921ab403..64c005dfa23bd157d891f3f10526327deb5e2cfa 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -361,6 +361,7 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar return of_irq_parse_oldworld(device, index, out_irq); /* Get the reg property (if any) */ + addr_len = 0; addr = of_get_property(device, "reg", &addr_len); /* Prevent out-of-bounds read in case of longer interrupt parent address size */ -- 2.34.1