blk: add an upper sanity check on partition adding

65536 should be ludicrous anyway but without it we overflow the
memory computation doing the allocation and badness occurs.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
index 4476e0e85d16..4a85096f5410 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -41,7 +41,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
                             sizeof(long long) > sizeof(long)) {
                                 long pstart = start, plength = length;
                                 if (pstart != start || plength != length
-                                    || pstart < 0 || plength < 0)
+                                    || pstart < 0 || plength < 0 || partno > 65535)
                                         return -EINVAL;
                         }