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kernfs: update kernfs_rename_ns() to consider KERNFS_STATIC_NAME

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kernfs_rename_ns() currently assumes that the target sysfs_dirent has
a copied name.  This has been okay because sysfs supports rename only
for directories which always have copied names; however, there's
nothing in kernfs interface which calls for such restriction and
currently invoking kernfs_rename_ns() on a regular file leads to oops
because it ends up trying to kfree() a static name.

This patch updates kernfs_rename_ns() so that it skips kfree() of the
old name if it's static.  This allows it to be used for all node
types.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-12-11 16:02:58 -05:00 committed by Greg Kroah-Hartman
parent 2063d608f5
commit 47a52e91f4
1 changed files with 5 additions and 1 deletions
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6
fs/kernfs/dir.c
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@ -886,7 +886,11 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
if (!new_name)
goto out;
kfree(kn->name);
if (kn->flags & KERNFS_STATIC_NAME)
kn->flags &= ~KERNFS_STATIC_NAME;
else
kfree(kn->name);
kn->name = new_name;
}