linux-kernel - [PATCH][TRIVIAL] mtip32xx: Fix NULL pointer dereference during module unload

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Date:	Tue, 14 May 2013 14:52:09 -0700
From:	Sam Bradshaw <sbradshaw@...ron.com>
To:	<axboe@...nel.dk>
CC:	<linux-kernel@...r.kernel.org>, <asamymuthupa@...ron.com>,
	<sbradshaw@...ron.com>
Subject: [PATCH][TRIVIAL] mtip32xx: Fix NULL pointer dereference during module
 unload

An open file-handle to one or more of the driver exported debugfs
nodes causes raciness in recursive removal during module unload;
sometimes a stale parent dentry is dereferenced when more than 1
pci device is present.

Signed-off-by: Sam Bradshaw <sbradshaw@...ron.com>
---
diff --git a/drivers/block/mtip32xx/mtip32xx.c
b/drivers/block/mtip32xx/mtip32xx.c
index 847107e..e366c74 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3002,7 +3002,8 @@ static int mtip_hw_debugfs_init(struct driver_data
*dd)

 static void mtip_hw_debugfs_exit(struct driver_data *dd)
 {
-	debugfs_remove_recursive(dd->dfs_node);
+	if (dd->dfs_node)
+		debugfs_remove_recursive(dd->dfs_node);
 }



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