This is a note to let you know that I've just added the patch titled
ovl: fix getcwd() failure after unsuccessful rmdir
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ovl-fix-getcwd-failure-after-unsuccessful-rmdir.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ce9113bbcbf45a57c082d6603b9a9f342be3ef74 Mon Sep 17 00:00:00 2001
From: Rui Wang <rui.y.wang@xxxxxxxxx>
Date: Fri, 8 Jan 2016 23:09:59 +0800
Subject: ovl: fix getcwd() failure after unsuccessful rmdir
From: Rui Wang <rui.y.wang@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Signed-off-by: Miklos Szeredi <miklos@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from rui.y.wang@xxxxxxxxx are
queue-4.4/ovl-fix-getcwd-failure-after-unsuccessful-rmdir.patch
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