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scsi: sg: sg_ioctl(): fix copyout handling 

First of all, __put_user() can fail with access_ok() succeeding.  And
access_ok() + __copy_to_user() is spelled copy_to_user()...

__put_user() *can* fail with access_ok() succeeding...

Link: https://lore.kernel.org/r/20191017193925.25539-1-viro@ZenIV.linux.org.uk
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Al Viro 2019-10-17 20:39:18 +01:00 коммит произвёл Martin K. Petersen
Родитель ec990306f7
Коммит a16a47416d
1 изменённых файлов: 16 добавлений и 27 удалений
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43
drivers/scsi/sg.c
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@ -963,26 +963,21 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
case SG_GET_LOW_DMA:
return put_user((int) sdp->device->host->unchecked_isa_dma, ip);
case SG_GET_SCSI_ID:
if (!access_ok(p, sizeof (sg_scsi_id_t)))
return -EFAULT;
else {
sg_scsi_id_t __user *sg_idp = p;
{
sg_scsi_id_t v;
if (atomic_read(&sdp->detaching))
return -ENODEV;
__put_user((int) sdp->device->host->host_no,
&sg_idp->host_no);
__put_user((int) sdp->device->channel,
&sg_idp->channel);
__put_user((int) sdp->device->id, &sg_idp->scsi_id);
__put_user((int) sdp->device->lun, &sg_idp->lun);
__put_user((int) sdp->device->type, &sg_idp->scsi_type);
__put_user((short) sdp->device->host->cmd_per_lun,
&sg_idp->h_cmd_per_lun);
__put_user((short) sdp->device->queue_depth,
&sg_idp->d_queue_depth);
__put_user(0, &sg_idp->unused[0]);
__put_user(0, &sg_idp->unused[1]);
memset(&v, 0, sizeof(v));
v.host_no = sdp->device->host->host_no;
v.channel = sdp->device->channel;
v.scsi_id = sdp->device->id;
v.lun = sdp->device->lun;
v.scsi_type = sdp->device->type;
v.h_cmd_per_lun = sdp->device->host->cmd_per_lun;
v.d_queue_depth = sdp->device->queue_depth;
if (copy_to_user(p, &v, sizeof(sg_scsi_id_t)))
return -EFAULT;
return 0;
}
case SG_SET_FORCE_PACK_ID:
@ -992,20 +987,16 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
sfp->force_packid = val ? 1 : 0;
return 0;
case SG_GET_PACK_ID:
if (!access_ok(ip, sizeof (int)))
return -EFAULT;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
list_for_each_entry(srp, &sfp->rq_list, entry) {
if ((1 == srp->done) && (!srp->sg_io_owned)) {
read_unlock_irqrestore(&sfp->rq_list_lock,
iflags);
__put_user(srp->header.pack_id, ip);
return 0;
return put_user(srp->header.pack_id, ip);
}
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
__put_user(-1, ip);
return 0;
return put_user(-1, ip);
case SG_GET_NUM_WAITING:
read_lock_irqsave(&sfp->rq_list_lock, iflags);
val = 0;
@ -1073,9 +1064,7 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
val = (sdp->device ? 1 : 0);
return put_user(val, ip);
case SG_GET_REQUEST_TABLE:
if (!access_ok(p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
return -EFAULT;
else {
{
sg_req_info_t *rinfo;
rinfo = kcalloc(SG_MAX_QUEUE, SZ_SG_REQ_INFO,
@ -1085,7 +1074,7 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
read_lock_irqsave(&sfp->rq_list_lock, iflags);
sg_fill_request_table(sfp, rinfo);
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
result = __copy_to_user(p, rinfo,
result = copy_to_user(p, rinfo,
SZ_SG_REQ_INFO * SG_MAX_QUEUE);
result = result ? -EFAULT : 0;
kfree(rinfo);