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[2/5] ceph: add additional range check in ceph_fallocate()

Message ID 20180718110427.7775-3-cgxu519@gmx.com (mailing list archive)
State New, archived
Headers show

Commit Message

Chengguang Xu July 18, 2018, 11:04 a.m. UTC 
If the range is larger than both real file size and limit of
max file size, then return -EFBIG.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
---
 fs/ceph/file.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ad0bed99b1d5..e588b23681e0 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1731,12 +1731,16 @@  static long ceph_fallocate(struct file *file, int mode,
 	struct ceph_osd_client *osdc =
 		&ceph_inode_to_client(inode)->client->osdc;
 	struct ceph_cap_flush *prealloc_cf;
+	struct ceph_fs_client *fsc = inode->i_sb->s_fs_info;
 	int want, got = 0;
 	int dirty;
 	int ret = 0;
 	loff_t endoff = 0;
 	loff_t size;
 
+	if ((offset + length) > max(i_size_read(inode), fsc->max_file_size))
+		return -EFBIG;
+
 	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
 		return -EOPNOTSUPP;