>From e09aae4796ac5b90c6514fc9789fc259bf783129 Mon Sep 17 00:00:00 2001
From: Tejun Heo <[email protected]>
Date: Tue, 10 Dec 2013 10:16:30 -0500
While restructuring the [u]mount path, 4b93dc9b1c68 ("sysfs, kernfs:
prepare mount path for kernfs") incorrectly updated sysfs_kill_sb() so
that it first kills super_block and then tries to dereference its
namespace tag to drop it. Fix it by caching namespace tag before
killing the superblock and then drop the cached namespace tag.
Signed-off-by: Tejun Heo <[email protected]>
Reported-by: Yuanhan Liu <[email protected]>
Tested-by: Yuanhan Liu <[email protected]>
Tested-by: Vlastimil Babka <[email protected]>
Link: http://lkml.kernel.org/g/[email protected]
---
fs/sysfs/mount.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index e7e3aa8..8d07527 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -45,8 +45,10 @@ static struct dentry *sysfs_mount(struct file_system_type
*fs_type,
static void sysfs_kill_sb(struct super_block *sb)
{
+ void *ns = (void *)kernfs_super_ns(sb);
+
kernfs_kill_sb(sb);
- kobj_ns_drop(KOBJ_NS_TYPE_NET, (void *)kernfs_super_ns(sb));
+ kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
}
static struct file_system_type sysfs_fs_type = {
--
1.8.4.2
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