linux-kernel - [PATCH AUTOSEL 4.19 42/57] staging: erofs: fix a missing endian conversion

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Message-Id: <20181104135144.88324-42-sashal@kernel.org>
Date:   Sun,  4 Nov 2018 08:51:29 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Gao Xiang <gaoxiang25@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 42/57] staging: erofs: fix a missing endian conversion

From: Gao Xiang <gaoxiang25@...wei.com>

[ Upstream commit 37ec35a6cc2b99eb7fd6b85b7d7b75dff46bc353 ]

This patch fixes a missing endian conversion in
vle_get_logical_extent_head.

Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/erofs/unzip_vle.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index 8721f0a41d15..14da8cc2246a 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1490,6 +1490,7 @@ static erofs_off_t vle_get_logical_extent_head(
 	unsigned long long ofs;
 	const unsigned int clusterbits = EROFS_SB(inode->i_sb)->clusterbits;
 	const unsigned int clustersize = 1 << clusterbits;
+	unsigned int delta0;
 
 	if (page->index != blkaddr) {
 		kunmap_atomic(*kaddr_iter);
@@ -1504,12 +1505,13 @@ static erofs_off_t vle_get_logical_extent_head(
 	di = *kaddr_iter + vle_extent_blkoff(inode, lcn);
 	switch (vle_cluster_type(di)) {
 	case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
-		BUG_ON(!di->di_u.delta[0]);
-		BUG_ON(lcn < di->di_u.delta[0]);
+		delta0 = le16_to_cpu(di->di_u.delta[0]);
+		DBG_BUGON(!delta0);
+		DBG_BUGON(lcn < delta0);
 
 		ofs = vle_get_logical_extent_head(inode,
 			page_iter, kaddr_iter,
-			lcn - di->di_u.delta[0], pcn, flags);
+			lcn - delta0, pcn, flags);
 		break;
 	case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
 		*flags ^= EROFS_MAP_ZIPPED;
-- 
2.17.1