linux-kernel - [PATCH] PCI/hotplug: ppc: correct a php

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Message-Id: <1520412364-2680-1-git-send-email-wei.guo.simon@gmail.com>
Date:   Wed,  7 Mar 2018 16:46:04 +0800
From:   wei.guo.simon@...il.com
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Simon Guo <wei.guo.simon@...il.com>
Subject: [PATCH] PCI/hotplug: ppc: correct a php_slot usage after free

From: Simon Guo <wei.guo.simon@...il.com>

In pnv_php_unregister_one(), pnv_php_put_slot() might kfree
php_slot structure. But there is pci_hp_deregister() after
that with php_slot reference.

This patch moves pnv_php_put_slot() to the end of function.

Signed-off-by: Simon Guo <wei.guo.simon@...il.com>
---
 drivers/pci/hotplug/pnv_php.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index 74f6a17..eb60692e 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -930,8 +930,8 @@ static void pnv_php_unregister_one(struct device_node *dn)
 		return;
 
 	php_slot->state = PNV_PHP_STATE_OFFLINE;
-	pnv_php_put_slot(php_slot);
 	pci_hp_deregister(&php_slot->slot);
+	pnv_php_put_slot(php_slot);
 }
 
 static void pnv_php_unregister(struct device_node *dn)
-- 
1.8.3.1