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Commit 2bd6efad authored by Alan Cox's avatar Alan Cox Committed by Jens Axboe
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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: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 97651ea6

block/ioctl.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -41,7 +41,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user 
			    sizeof(long long) > sizeof(long)) {

			    sizeof(long long) > sizeof(long)) {

				long pstart = start, plength = length;

				long pstart = start, plength = length;

				if (pstart != start || plength != length

				if (pstart != start || plength != length

				    || pstart < 0 || plength < 0)

				    || pstart < 0 || plength < 0 || partno > 65535)

					return -EINVAL;

					return -EINVAL;

			}

			}