ceph: check negative offsets in ceph_llseek()

When a user requests SEEK_HOLE or SEEK_DATA with a negative offset
ceph_llseek should return -ENXIO.  Currently -EINVAL is being returned for
SEEK_DATA and 0 for SEEK_HOLE.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2eb43a54e2d6..9634eb79b041 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1481,13 +1481,13 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
                 offset += file->f_pos;
                 break;
         case SEEK_DATA:
-                if (offset >= i_size) {
+                if (offset < 0 || offset >= i_size) {
                         ret = -ENXIO;
                         goto out;
                 }
                 break;
         case SEEK_HOLE:
-                if (offset >= i_size) {
+                if (offset < 0 || offset >= i_size) {
                         ret = -ENXIO;
                         goto out;
                 }