kernfs: remove unnecessary NULL check in __kernfs_remove()
895a068a524e ("kernfs: make kernfs_get_active() block if the node is
deactivated but not removed") added "struct kernfs_root *root =
kernfs_root(kn);" at the head of the function; however, the parameter
@kn is checked for later implying that the function may be called with
NULL. This means that we may end up invoking kernfs_root() with NULL
which will oops. None of the existing users invokes removal with NULL
@kn, so this bug doesn't actually trigger.
We can relocate kernfs_root() invocation after NULL check; however,
allowing NULL param tends to cause more confusion than actually
helping anything. As there's no existing user, let's remove the
spurious NULL check.
This bug was detected by smatch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index a8028be..4076e8a 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -920,9 +920,6 @@
lockdep_assert_held(&kernfs_mutex);
- if (!kn)
- return;
-
pr_debug("kernfs %s: removing\n", kn->name);
__kernfs_deactivate(kn);