linux-ext4 - [PATCH] ext4: Reset error code in ext4_find

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Date:   Wed, 6 Jun 2018 13:49:46 -0500
From:   Eric Sandeen <sandeen@...hat.com>
To:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Cc:     anatoly.trosinenko@...dex.com
Subject: [PATCH] ext4: Reset error code in ext4_find_entry in fallback

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>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b1f21e3a0763..559b2b9d392a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1398,6 +1400,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
 			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) {