From: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
[ Upstream commit e7933278b442f97809b1ea84264586302bd08a03 ]
Partial decompression should be checked after updating length.
It's a new regression when introducing multi-reference pclusters.
Fixes: 2bfab9c0edac ("erofs: record the longest decompressed size in this round")
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221014064915.8103-1-hsiangkao@xxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/erofs/zdata.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 6e663275aeb1..c7511b431776 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -765,13 +765,13 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
if (fe->pcl->pageofs_out != (map->m_la & ~PAGE_MASK))
fe->pcl->multibases = true;
- if ((map->m_flags & EROFS_MAP_FULL_MAPPED) &&
- fe->pcl->length == map->m_llen)
- fe->pcl->partial = false;
if (fe->pcl->length < offset + end - map->m_la) {
fe->pcl->length = offset + end - map->m_la;
fe->pcl->pageofs_out = map->m_la & ~PAGE_MASK;
}
+ if ((map->m_flags & EROFS_MAP_FULL_MAPPED) &&
+ fe->pcl->length == map->m_llen)
+ fe->pcl->partial = false;
next_part:
/* shorten the remaining extent to update progress */
map->m_llen = offset + cur - map->m_la;
--
2.35.1
