diff options
Diffstat (limited to 'block/ioctl.c')
| -rw-r--r-- | block/ioctl.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/ioctl.c b/block/ioctl.c index 06ff3023e2a1..49fa02b17ec1 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -95,6 +95,7 @@ static int compat_blkpg_ioctl(struct block_device *bdev, static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, unsigned long arg) { + unsigned int bs_mask = bdev_logical_block_size(bdev) - 1; uint64_t range[2]; uint64_t start, len; struct inode *inode = bdev->bd_inode; @@ -105,6 +106,8 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, if (!bdev_max_discard_sectors(bdev)) return -EOPNOTSUPP; + if (bdev_read_only(bdev)) + return -EPERM; if (copy_from_user(range, (void __user *)arg, sizeof(range))) return -EFAULT; @@ -112,9 +115,9 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, start = range[0]; len = range[1]; - if (start & 511) + if (!len) return -EINVAL; - if (len & 511) + if ((start | len) & bs_mask) return -EINVAL; if (start + len > bdev_nr_bytes(bdev)) |