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| author | Chengguang Xu <cgxu519@gmx.com> | 2018-07-19 17:15:26 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2018-08-02 22:33:28 +0300 |
| commit | 8687a3e2c7a026c173ac2e0d65d869c98c154a3a (patch) | |
| tree | 22a099b8e861972165e9e736c335c2ed42bfb817 /fs/ceph | |
| parent | 0671e9968dfb3f99a366df816c361b8e871dba1b (diff) | |
| download | linux-8687a3e2c7a026c173ac2e0d65d869c98c154a3a.tar.xz | |
ceph: add additional offset check in ceph_write_iter()
If the offset is larger or equal to both real file size and
max file size, then return -EFBIG.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/file.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 2c54d2674db6..b9cd9d271dcb 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -1384,12 +1384,12 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) struct ceph_file_info *fi = file->private_data; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); - struct ceph_osd_client *osdc = - &ceph_sb_to_client(inode->i_sb)->client->osdc; + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_cap_flush *prealloc_cf; ssize_t count, written = 0; int err, want, got; loff_t pos; + loff_t limit = max(i_size_read(inode), fsc->max_file_size); if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; @@ -1415,6 +1415,13 @@ retry_snap: goto out; pos = iocb->ki_pos; + if (unlikely(pos >= limit)) { + err = -EFBIG; + goto out; + } else { + iov_iter_truncate(from, limit - pos); + } + count = iov_iter_count(from); if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) { err = -EDQUOT; @@ -1436,7 +1443,7 @@ retry_snap: } /* FIXME: not complete since it doesn't account for being at quota */ - if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) { + if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_FULL)) { err = -ENOSPC; goto out; } @@ -1526,7 +1533,7 @@ retry_snap: } if (written >= 0) { - if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL)) + if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_NEARFULL)) iocb->ki_flags |= IOCB_DSYNC; written = generic_write_sync(iocb, written); } |