linux-kernel - [PATCH 4.17 106/336] Btrfs: dont BUG_ON() in btrfs_truncate_inode

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Message-Id: <20180801165033.213982314@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:47:21 +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, Nikolay Borisov <nborisov@...e.com>,
        Omar Sandoval <osandov@...com>,
        David Sterba <dsterba@...e.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 106/336] Btrfs: dont BUG_ON() in btrfs_truncate_inode_items()

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

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

From: Omar Sandoval <osandov@...com>

[ Upstream commit 0552210997badb6a60740a26ff9d976a416510f0 ]

btrfs_free_extent() can fail because of ENOMEM. There's no reason to
panic here, we can just abort the transaction.

Fixes: f4b9aa8d3b87 ("btrfs_truncate")
Reviewed-by: Nikolay Borisov <nborisov@...e.com>
Signed-off-by: Omar Sandoval <osandov@...com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/inode.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4671,7 +4671,10 @@ delete:
 						extent_num_bytes, 0,
 						btrfs_header_owner(leaf),
 						ino, extent_offset);
-			BUG_ON(ret);
+			if (ret) {
+				btrfs_abort_transaction(trans, ret);
+				break;
+			}
 			if (btrfs_should_throttle_delayed_refs(trans, fs_info))
 				btrfs_async_run_delayed_refs(fs_info,
 					trans->delayed_ref_updates * 2,