[PATCH] ceph: check negative offsets on ceph_llseek()

Luis Henriques
2017-07-28T10:56:49Z

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>
---
fs/ceph/file.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 3d48c415f3cb..e1912e67843f 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;
}