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authorChengguang Xu <cgxu519@gmx.com>2018-07-19 22:15:26 +0800
committerIlya Dryomov <idryomov@gmail.com>2018-08-02 21:33:28 +0200
commit8687a3e2c7a026c173ac2e0d65d869c98c154a3a (patch)
tree22a099b8e861972165e9e736c335c2ed42bfb817 /fs/ceph
parent0671e9968dfb3f99a366df816c361b8e871dba1b (diff)
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.c15
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);
}