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Message-Id: <20160314175019.734325445@linuxfoundation.org> Date: Mon, 14 Mar 2016 10:51:03 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Rui Wang <rui.y.wang@...el.com>, Konstantin Khlebnikov <koct9i@...il.com>, Miklos Szeredi <miklos@...redi.hu> Subject: [PATCH 4.4 45/50] ovl: fix getcwd() failure after unsuccessful rmdir 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rui Wang <rui.y.wang@...el.com> commit ce9113bbcbf45a57c082d6603b9a9f342be3ef74 upstream. ovl_remove_upper() should do d_drop() only after it successfully removes the dir, otherwise a subsequent getcwd() system call will fail, breaking userspace programs. This is to fix: https://bugzilla.kernel.org/show_bug.cgi?id=110491 Signed-off-by: Rui Wang <rui.y.wang@...el.com> Reviewed-by: Konstantin Khlebnikov <koct9i@...il.com> Signed-off-by: Miklos Szeredi <miklos@...redi.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- fs/overlayfs/dir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -618,7 +618,8 @@ static int ovl_remove_upper(struct dentr * sole user of this dentry. Too tricky... Just unhash for * now. */ - d_drop(dentry); + if (!err) + d_drop(dentry); mutex_unlock(&dir->i_mutex); return err;
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