From: Gao Xiang hsiangkao@redhat.com
commit 24a806d849c0b0c1d0cd6a6b93ba4ae4c0ec9f08 upstream.
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.
Link: https://lore.kernel.org/r/20210329003614.6583-1-hsiangkao@aol.com Fixes: 431339ba9042 ("staging: erofs: add inode operations") Cc: stable@vger.kernel.org # 4.19+ Signed-off-by: Gao Xiang hsiangkao@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/staging/erofs/erofs_fs.h | 3 +++ drivers/staging/erofs/inode.c | 6 ++++++ 2 files changed, 9 insertions(+)
--- a/drivers/staging/erofs/erofs_fs.h +++ b/drivers/staging/erofs/erofs_fs.h @@ -71,6 +71,9 @@ enum { #define EROFS_I_VERSION_BIT 0 __EROFS_BIT(EROFS_I_, DATA_MAPPING, VERSION);
+#define EROFS_I_ALL \ + ((1 << (EROFS_I_DATA_MAPPING_BIT + EROFS_I_DATA_MAPPING_BITS)) - 1) + struct erofs_inode_v1 { /* 0 */__le16 i_advise;
--- a/drivers/staging/erofs/inode.c +++ b/drivers/staging/erofs/inode.c @@ -48,6 +48,12 @@ static struct page *read_inode(struct in v1 = page_address(page) + *ofs; ifmt = le16_to_cpu(v1->i_advise);
+ if (ifmt & ~EROFS_I_ALL) { + errln("unsupported i_format %u of nid %llu", ifmt, vi->nid); + err = -EOPNOTSUPP; + goto err_out; + } + vi->data_mapping_mode = __inode_data_mapping(ifmt); if (unlikely(vi->data_mapping_mode >= EROFS_INODE_LAYOUT_MAX)) { errln("unknown data mapping mode %u of nid %llu",