From: Gao Xiang <gaoxiang25@huawei.com>
Date: Tue, 21 Aug 2018 14:49:36 +0000 (+0800)
Subject: staging: erofs: fix compression mapping beyond EOF
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d6421a46af70ce8d74f27ee1a099a23b4c90e691;p=linux.git

staging: erofs: fix compression mapping beyond EOF

Logical address of EOF LTP mapping should start at
`inode->i_size' rather than `inode->i_size - 1' to
`m_la(in)', fix it.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index dab892157e51f..6c4c9280cb8c5 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1548,7 +1548,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 	if (unlikely(map->m_la >= inode->i_size)) {
 		BUG_ON(!initial);
 		map->m_llen = map->m_la + 1 - inode->i_size;
-		map->m_la = inode->i_size - 1;
+		map->m_la = inode->i_size;
 		map->m_flags = 0;
 		goto out;
 	}