From a0c9aa92c7992452d18b420671167aba42128653 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Thu, 27 Sep 2018 22:15:31 -0700
Subject: [PATCH] f2fs: fix missing up_read

commit 89d13c38501df730cbb2e02c4499da1b5187119d upstream.

This patch fixes missing up_read call.

Fixes: c9b60788fc76 ("f2fs: fix to do sanity check with block address in main area")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/node.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 016473fc267d..3685fea62333 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1342,8 +1342,10 @@ static int f2fs_write_node_page(struct page *page,
 	}
 
 	if (__is_valid_data_blkaddr(ni.blk_addr) &&
-		!f2fs_is_valid_blkaddr(sbi, ni.blk_addr, DATA_GENERIC))
+		!f2fs_is_valid_blkaddr(sbi, ni.blk_addr, DATA_GENERIC)) {
+		up_read(&sbi->node_write);
 		goto redirty_out;
+	}
 
 	set_page_writeback(page);
 	fio.blk_addr = ni.blk_addr;