linux-kernel - [PATCH 4.18 044/123] ext4: reset error code in ext4_find

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Message-Id: <20180903165721.331956417@linuxfoundation.org>
Date:   Mon,  3 Sep 2018 18:56:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Anatoly Trosinenko <anatoly.trosinenko@...dex.com>,
        Andreas Dilger <adilger@...ger.ca>,
        Eric Sandeen <sandeen@...hat.com>, Theodore Tso <tytso@....edu>
Subject: [PATCH 4.18 044/123] ext4: reset error code in ext4_find_entry in fallback

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

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

From: Eric Sandeen <sandeen@...hat.com>

commit f39b3f45dbcb0343822cce31ea7636ad66e60bc2 upstream.

When ext4_find_entry() falls back to "searching the old fashioned
way" due to a corrupt dx dir, it needs to reset the error code
to NULL so that the nonstandard ERR_BAD_DX_DIR code isn't returned
to userspace.

https://bugzilla.kernel.org/show_bug.cgi?id=199947

Reported-by: Anatoly Trosinenko <anatoly.trosinenko@...dex.com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/namei.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1398,6 +1398,7 @@ static struct buffer_head * ext4_find_en
 			goto cleanup_and_exit;
 		dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
 			       "falling back\n"));
+		ret = NULL;
 	}
 	nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
 	if (!nblocks) {