linux-kernel - [tip:tracing/blktrace] blktrace: avoid accessing NULL bdev->bd

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Message-ID: <tip-b125130b22d67f249beba10b71a254558b5279d0@git.kernel.org>
Date:	Sat, 21 Mar 2009 15:19:19 GMT
From:	Li Zefan <lizf@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, lizf@...fujitsu.com, jens.axboe@...cle.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:tracing/blktrace] blktrace: avoid accessing NULL bdev->bd_disk

Commit-ID:  b125130b22d67f249beba10b71a254558b5279d0
Gitweb:     http://git.kernel.org/tip/b125130b22d67f249beba10b71a254558b5279d0
Author:     Li Zefan <lizf@...fujitsu.com>
AuthorDate: Fri, 20 Mar 2009 10:34:00 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 21 Mar 2009 16:17:24 +0100

blktrace: avoid accessing NULL bdev->bd_disk

bdev->bd_disk can be NULL, if the block device is not opened.

Try this against an unmounted partition, and you'll see NULL dereference:

  # echo 1 > /sys/block/sda/sda5/enable

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jens Axboe <jens.axboe@...cle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <49C30098.6080107@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/blktrace.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index dfee6f9..108f4f7 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1362,6 +1362,14 @@ static int blk_str2act_mask(const char *str)
 	return mask;
 }
 
+static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
+{
+	if (bdev->bd_disk == NULL)
+		return NULL;
+
+	return bdev_get_queue(bdev);
+}
+
 static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
 					 struct device_attribute *attr,
 					 char *buf)
@@ -1376,9 +1384,10 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
 	if (bdev == NULL)
 		goto out_unlock_kernel;
 
-	q = bdev_get_queue(bdev);
+	q = blk_trace_get_queue(bdev);
 	if (q == NULL)
 		goto out_bdput;
+
 	mutex_lock(&bdev->bd_mutex);
 
 	if (attr == &dev_attr_enable) {
@@ -1435,7 +1444,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
 	if (bdev == NULL)
 		goto out_unlock_kernel;
 
-	q = bdev_get_queue(bdev);
+	q = blk_trace_get_queue(bdev);
 	if (q == NULL)
 		goto out_bdput;
 
--
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