From 63f264965947ac6299452711f614f086955b2515 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Sun, 25 May 2014 21:43:33 +0900 Subject: block: fix BLKSECTGET ioctl when max_sectors is greater than USHRT_MAX BLKSECTGET ioctl loads the request queue's max_sectors as unsigned short value to the argument pointer. So if the max_sector is greater than USHRT_MAX, the upper 16 bits of that is just discarded. In such case, USHRT_MAX is more preferable than the lower 16 bits of max_sectors. Signed-off-by: Akinobu Mita Cc: Jens Axboe Cc: "James E.J. Bottomley" Cc: Douglas Gilbert Cc: linux-scsi@vger.kernel.org Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/ioctl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'block/ioctl.c') diff --git a/block/ioctl.c b/block/ioctl.c index 7d5c3b20af45..d6cda8147c91 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -278,6 +278,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, struct backing_dev_info *bdi; loff_t size; int ret, n; + unsigned int max_sectors; switch(cmd) { case BLKFLSBUF: @@ -375,7 +376,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, case BLKDISCARDZEROES: return put_uint(arg, bdev_discard_zeroes_data(bdev)); case BLKSECTGET: - return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); + max_sectors = min_t(unsigned int, USHRT_MAX, + queue_max_sectors(bdev_get_queue(bdev))); + return put_ushort(arg, max_sectors); case BLKROTATIONAL: return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev))); case BLKRASET: -- cgit v1.2.3-59-g8ed1b