linux-kernel - [PATCH 4.8 047/138] ubifs: Fix regression in ubifs

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Message-Id: <20161109102846.842050675@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:45:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Rosin <peda@...ntia.se>,
        Ralph Sennhauser <ralph.sennhauser@...il.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 4.8 047/138] ubifs: Fix regression in ubifs_readdir()

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit a00052a296e54205cf238c75bd98d17d5d02a6db upstream.

Commit c83ed4c9dbb35 ("ubifs: Abort readdir upon error") broke
overlayfs support because the fix exposed an internal error
code to VFS.

Reported-by: Peter Rosin <peda@...ntia.se>
Tested-by: Peter Rosin <peda@...ntia.se>
Reported-by: Ralph Sennhauser <ralph.sennhauser@...il.com>
Tested-by: Ralph Sennhauser <ralph.sennhauser@...il.com>
Fixes: c83ed4c9dbb35 ("ubifs: Abort readdir upon error")
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ubifs/dir.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -454,6 +454,14 @@ out:
 
 	if (err != -ENOENT)
 		ubifs_err(c, "cannot find next direntry, error %d", err);
+	else
+		/*
+		 * -ENOENT is a non-fatal error in this context, the TNC uses
+		 * it to indicate that the cursor moved past the current directory
+		 * and readdir() has to stop.
+		 */
+		err = 0;
+
 
 	/* 2 is a special value indicating that there are no more direntries */
 	ctx->pos = 2;