From c99658fe970f442199733bcace1a00b087336a0d Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 24 Dec 2009 02:27:30 -0500 Subject: [PATCH] bail out with ELOOP earlier in do_link loop If we'd passed through 32 trailing symlinks already, there's no sense following the 33rd - we'll bail out anyway. Better bugger off earlier. It *does* change behaviour, after a fashion - if the 33rd happens to be a procfs-style symlink, original code *would* allow it. This one will not. Cry me a river if that hurts you. Please, do. And post a video of that, while you are at it. Signed-off-by: Al Viro --- fs/namei.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 976fc323272e..84f1ec3b4a5d 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1873,7 +1873,7 @@ exit_parent: do_link: error = -ELOOP; - if (flag & O_NOFOLLOW) + if ((flag & O_NOFOLLOW) || count++ == 32) goto exit_dput; /* * This is subtle. Instead of calling do_follow_link() we do the @@ -1915,11 +1915,6 @@ do_link: __putname(nd.last.name); goto exit; } - error = -ELOOP; - if (count++==32) { - __putname(nd.last.name); - goto exit; - } filp = do_last(&nd, &path, open_flag, flag, acc_mode, mode, pathname, &is_link); __putname(nd.last.name);