linux-kernel - [PATCH] erofs: fix inline pcluster memory leak

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Message-Id: <20221202033327.52702-1-hsiangkao@linux.alibaba.com>
Date:   Fri,  2 Dec 2022 11:33:27 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     linux-erofs@...ts.ozlabs.org, Yue Hu <huyue2@...lpad.com>,
        Chao Yu <chao@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>,
        syzbot+6f8cd9a0155b366d227f@...kaller.appspotmail.com,
        Yue Hu <huyue2@...ong.com>
Subject: [PATCH] erofs: fix inline pcluster memory leak

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

Reported-by: syzbot+6f8cd9a0155b366d227f@...kaller.appspotmail.com
Fixes: cecf864d3d76 ("erofs: support inline data decompression")
Cc: Yue Hu <huyue2@...ong.com>
Signed-off-by: Gao Xiang <hsiangkao@...ux.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