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ceph: return EIO on invalid layout on GET_DATALOC ioctl 

If the user calls GET_DATALOC on a file with an invalid (e.g.,
zeroed) layout, return EIO to userland.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
This commit is contained in:
Sage Weil 2012-09-24 21:04:57 -07:00 committed by Alex Elder
parent 6cae3717cd
commit 457712a0bc
1 changed files with 6 additions and 2 deletions
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8
fs/ceph/ioctl.c
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@ -187,14 +187,18 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
u64 tmp;
struct ceph_object_layout ol;
struct ceph_pg pgid;
int r;
/* copy and validate */
if (copy_from_user(&dl, arg, sizeof(dl)))
return -EFAULT;
down_read(&osdc->map_sem);
ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
&dl.object_no, &dl.object_offset, &olen);
r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
&dl.object_no, &dl.object_offset,
&olen);
if (r < 0)
return -EIO;
dl.file_offset -= dl.object_offset;
dl.object_size = ceph_file_layout_object_size(ci->i_layout);
dl.block_size = ceph_file_layout_su(ci->i_layout);