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ceph: add additional offset check in ceph_write_iter()

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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>
This commit is contained in:
Chengguang Xu 2018-07-19 22:15:26 +08:00 committed by Ilya Dryomov
parent 0671e9968d
commit 8687a3e2c7
1 changed files with 11 additions and 4 deletions
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15
fs/ceph/file.c
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@ -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);
}