From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> We know there's no loops by the time we call it; the only thing we care about is too deep reverse paths. Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> --- fs/eventpoll.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 3e6f1f97f246..0f540e91aa92 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1311,7 +1311,7 @@ static int reverse_path_check_proc(struct file *file, int depth) int error = 0; struct epitem *epi; - if (!ep_push_nested(file)) /* limits recursion */ + if (depth > EP_MAX_NESTS) /* too deep nesting */ return -1; /* CTL_DEL can remove links here, but that can't increase our count */ @@ -1336,7 +1336,6 @@ static int reverse_path_check_proc(struct file *file, int depth) } } rcu_read_unlock(); - nesting--; /* pop */ return error; } -- 2.11.0
