scsi: sg: sg_read(): simplify reading ->pack_id of userland sg_io_hdr_t

We don't need to allocate a temporary buffer and read the entire structure
in it, only to fetch a single field and free what we'd allocated.  Just use
get_user() and be done with it...

Link: https://lore.kernel.org/r/20191017193925.25539-4-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>

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 4c62237..2d30e89 100644 (file)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -441,17 +441,8 @@ sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
                }
                if (old_hdr->reply_len < 0) {
                        if (count >= SZ_SG_IO_HDR) {
-                               sg_io_hdr_t *new_hdr;
-                               new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
-                               if (!new_hdr) {
-                                       retval = -ENOMEM;
-                                       goto free_old_hdr;
-                               }
-                               retval =__copy_from_user
-                                   (new_hdr, buf, SZ_SG_IO_HDR);
-                               req_pack_id = new_hdr->pack_id;
-                               kfree(new_hdr);
-                               if (retval) {
+                               sg_io_hdr_t __user *p = (void __user *)buf;
+                               if (get_user(req_pack_id, &p->pack_id)) {
                                        retval = -EFAULT;
                                        goto free_old_hdr;
                                }