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compat_hdio_ioctl: get rid of set_fs() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-06-27 15:51:38 -04:00
parent 229b53c9bf
commit 30138384da
1 changed files with 6 additions and 9 deletions
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15
block/compat_ioctl.c
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@ -79,19 +79,16 @@ static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
mm_segment_t old_fs = get_fs();
unsigned long kval;
unsigned int __user *uvp;
unsigned long *__user p;
int error;
set_fs(KERNEL_DS);
p = compat_alloc_user_space(sizeof(unsigned long));
error = __blkdev_driver_ioctl(bdev, mode,
cmd, (unsigned long)(&kval));
set_fs(old_fs);
cmd, (unsigned long)p);
if (error == 0) {
uvp = compat_ptr(arg);
if (put_user(kval, uvp))
unsigned int __user *uvp = compat_ptr(arg);
unsigned long v;
if (get_user(v, p) || put_user(v, uvp))
error = -EFAULT;
}
return error;