Commit 52c3ce4e authored Apr 27, 2011 by Catalin Marinas

kmemleak: Do not return a pointer to an object that kmemleak did not get



The kmemleak_seq_next() function tries to get an object (and increment
its use count) before returning it. If it could not get the last object
during list traversal (because it may have been freed), the function
should return NULL rather than a pointer to such object that it did not
get.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Acked-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Cc: <stable@kernel.org>

parent 8e10cd74

mm/kmemleak.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -1414,10 +1414,13 @@ static void kmemleak_seq_next(struct seq_file seq, void v, loff_t pos)
		++(*pos);

		list_for_each_continue_rcu(n, &object_list) {
		next_obj = list_entry(n, struct kmemleak_object, object_list);
		if (get_object(next_obj))
		struct kmemleak_object *obj =
		list_entry(n, struct kmemleak_object, object_list);
		if (get_object(obj)) {
		next_obj = obj;
		break;
		}
		}

		put_object(prev_obj);
		return next_obj;