linux-kernel - [PATCH 3.16 024/366] PCI: ibmphp: Fix use-before-set in get_max_bus

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>
Subject: [PATCH 3.16 024/366] PCI: ibmphp: Fix use-before-set in
 get_max_bus_speed()

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 4051f5ebb11c6ef4b0d3eac2fbbd187c070656c5 upstream.

The "rc" variable is only initialized on the error path.  The caller
doesn't check the return but, if "rc" is non-zero, then this function is
basically a no-op.

Fixes: 3749c51ac6c1 ("PCI: Make current and maximum bus speeds part of the PCI core")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pci/hotplug/ibmphp_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/hotplug/ibmphp_core.c
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -397,7 +397,7 @@ static int get_adapter_present(struct ho
 
 static int get_max_bus_speed(struct slot *slot)
 {
-	int rc;
+	int rc = 0;
 	u8 mode = 0;
 	enum pci_bus_speed speed;
 	struct pci_bus *bus = slot->hotplug_slot->pci_slot->bus;