linux-kernel - [PATCH 4.17 26/70] btrfs: return error value if create_io_em failed in cow_file

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Message-Id: <20180624142742.095702035@linuxfoundation.org>
Date:   Sun, 24 Jun 2018 23:22:18 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Su Yue <suy.fnst@...fujitsu.com>,
        Nikolay Borisov <nborisov@...e.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 4.17 26/70] btrfs: return error value if create_io_em failed in cow_file_range

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

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

From: Su Yue <suy.fnst@...fujitsu.com>

commit 090a127afa8f73e9618d4058d6755f7ec7453dd6 upstream.

In cow_file_range(), create_io_em() may fail, but its return value is
not recorded.  Then return value may be 0 even it failed which is a
wrong behavior.

Let cow_file_range() return PTR_ERR(em) if create_io_em() failed.

Fixes: 6f9994dbabe5 ("Btrfs: create a helper to create em for IO")
CC: stable@...r.kernel.org # 4.11+
Signed-off-by: Su Yue <suy.fnst@...fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/inode.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1018,8 +1018,10 @@ static noinline int cow_file_range(struc
 				  ram_size, /* ram_bytes */
 				  BTRFS_COMPRESS_NONE, /* compress_type */
 				  BTRFS_ORDERED_REGULAR /* type */);
-		if (IS_ERR(em))
+		if (IS_ERR(em)) {
+			ret = PTR_ERR(em);
 			goto out_reserve;
+		}
 		free_extent_map(em);
 
 		ret = btrfs_add_ordered_extent(inode, start, ins.objectid,