From: Rui Wang <rui.y.wang@intel.com>
Date: Fri, 8 Jan 2016 15:09:59 +0000 (+0800)
Subject: ovl: fix getcwd() failure after unsuccessful rmdir
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ce9113bbcbf45a57c082d6603b9a9f342be3ef74;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ovl: fix getcwd() failure after unsuccessful rmdir

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@intel.com>
Reviewed-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@vger.kernel.org>
---

diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index ed95272d57a6..795ab65ccdf5 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -618,7 +618,8 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
 	 * sole user of this dentry.  Too tricky...  Just unhash for
 	 * now.
 	 */
-	d_drop(dentry);
+	if (!err)
+		d_drop(dentry);
 	inode_unlock(dir);
 
 	return err;