block: check partition alignment

[mirror_ubuntu-zesty-kernel.git] / block / ioctl.c

diff --git a/block/ioctl.c b/block/ioctl.c
index f856963204f4949f5197c1cb0c0a247ca12c95da..656c8c6ed206f876bbdbd0f240dedf9997a88cf0 100644 (file)
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -45,6 +45,9 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
                                    || pstart < 0 || plength < 0 || partno > 65535)
                                        return -EINVAL;
                        }
+                       /* check if partition is aligned to blocksize */
+                       if (p.start & (bdev_logical_block_size(bdev) - 1))
+                               return -EINVAL;
 
                        mutex_lock(&bdev->bd_mutex);