[PATCH] erofs: fix inline pcluster memory leak

[Gao Xiang]

Inline pcluster should be freed right after it is decompressed.
Otherwise inline pclusters will be leaked.

Reported-by: syzbot+6f8cd9a0155b366d227f at syzkaller.appspotmail.com
Fixes: cecf864d3d76 ("erofs: support inline data decompression")
Cc: Yue Hu <huyue2 at yulong.com>
Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
 fs/erofs/zdata.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index ab22100be861..e14e6c32e70d 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -496,7 +496,8 @@ static int z_erofs_register_pcluster(struct z_erofs_decompress_frontend *fe)
 	struct erofs_workgroup *grp;
 	int err;
 
-	if (!(map->m_flags & EROFS_MAP_ENCODED)) {
+	if (!(map->m_flags & EROFS_MAP_ENCODED) ||
+	    !(map->m_pa >> PAGE_SHIFT)) {
 		DBG_BUGON(1);
 		return -EFSCORRUPTED;
 	}
@@ -1114,6 +1115,8 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
 	/* pcluster lock MUST be taken before the following line */
 	WRITE_ONCE(pcl->next, Z_EROFS_PCLUSTER_NIL);
 	mutex_unlock(&pcl->lock);
+	if (z_erofs_is_inline_pcluster(pcl))
+		z_erofs_free_pcluster(pcl);
 	return err;
 }
 
-- 
2.24.4