block, zoned: fix integer overflow with BLKRESETZONE et al

Check for overflow in addition before checking for end-of-block-device.

Steps to reproduce:

	#define _GNU_SOURCE 1
	#include <sys/ioctl.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>

	typedef unsigned long long __u64;

	struct blk_zone_range {
	        __u64 sector;
	        __u64 nr_sectors;
	};

	#define BLKRESETZONE    _IOW(0x12, 131, struct blk_zone_range)

	int main(void)
	{
	        int fd = open("/dev/nullb0", O_RDWR|O_DIRECT);
	        struct blk_zone_range zr = {4096, 0xfffffffffffff000ULL};
	        ioctl(fd, BLKRESETZONE, &zr);
	        return 0;
	}

BUG: KASAN: null-ptr-deref in submit_bio_wait+0x74/0xe0
Write of size 8 at addr 0000000000000040 by task a.out/1590

CPU: 8 PID: 1590 Comm: a.out Not tainted 5.6.0-rc1-00019-g359c92c02bfa #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190711_202441-buildvm-armv7-10.arm.fedoraproject.org-2.fc31 04/01/2014
Call Trace:
 dump_stack+0x76/0xa0
 __kasan_report.cold+0x5/0x3e
 kasan_report+0xe/0x20
 submit_bio_wait+0x74/0xe0
 blkdev_zone_mgmt+0x26f/0x2a0
 blkdev_zone_mgmt_ioctl+0x14b/0x1b0
 blkdev_ioctl+0xb28/0xe60
 block_ioctl+0x69/0x80
 ksys_ioctl+0x3af/0xa50

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alexey Dobriyan (SK hynix) <adobriyan@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions