From: Gao Xiang via Linux-erofs <linux-erofs@lists.ozlabs.org>
To: linux-erofs@lists.ozlabs.org, Chao Yu <yuchao0@huawei.com>,
Chao Yu <chao@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org
Subject: [PATCH] erofs: add unsupported inode i_format check
Date: Mon, 29 Mar 2021 08:36:14 +0800 [thread overview]
Message-ID: <20210329003614.6583-1-hsiangkao@aol.com> (raw)
In-Reply-To: 20210329003614.6583-1-hsiangkao.ref@aol.com
From: Gao Xiang <hsiangkao@redhat.com>
If any unknown i_format fields are set (may be of some new incompat
inode features), mark such inode as unsupported.
Just in case of any new incompat i_format fields added in the future.
Fixes: 431339ba9042 ("staging: erofs: add inode operations")
Cc: <stable@vger.kernel.org> # 4.19+
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
new potential inode features can also be covered by COMPR_CFGS & BIG_PCLUSTER
in the next cycle at least, and possibly need its new sb incompat feature as
well so it's not quite vital.
fs/erofs/erofs_fs.h | 3 +++
fs/erofs/inode.c | 7 +++++++
2 files changed, 10 insertions(+)
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 9ad1615f4474..e8d04d808fa6 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -75,6 +75,9 @@ static inline bool erofs_inode_is_data_compressed(unsigned int datamode)
#define EROFS_I_VERSION_BIT 0
#define EROFS_I_DATALAYOUT_BIT 1
+#define EROFS_I_ALL \
+ ((1 << (EROFS_I_DATALAYOUT_BIT + EROFS_I_DATALAYOUT_BITS)) - 1)
+
/* 32-byte reduced form of an ondisk inode */
struct erofs_inode_compact {
__le16 i_format; /* inode format hints */
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 119fdce1b520..7ed2d7391692 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -44,6 +44,13 @@ static struct page *erofs_read_inode(struct inode *inode,
dic = page_address(page) + *ofs;
ifmt = le16_to_cpu(dic->i_format);
+ if (ifmt & ~EROFS_I_ALL) {
+ erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu",
+ ifmt, vi->nid);
+ err = -EOPNOTSUPP;
+ goto err_out;
+ }
+
vi->datalayout = erofs_inode_datalayout(ifmt);
if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
--
2.20.1
parent reply other threads:[~2021-03-29 0:36 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20210329003614.6583-1-hsiangkao.ref@aol.com>]
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