scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()

The following issue was observed running syzkaller:

BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]
BUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831
Read of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815

CPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xe4/0x14a lib/dump_stack.c:118
print_address_description+0x73/0x280 mm/kasan/report.c:253
kasan_report_error mm/kasan/report.c:352 [inline]
kasan_report+0x272/0x370 mm/kasan/report.c:410
memcpy+0x1f/0x50 mm/kasan/kasan.c:302
memcpy include/linux/string.h:377 [inline]
sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831
fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021
resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772
schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429
scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835
scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896
scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034
__blk_run_queue_uncond block/blk-core.c:464 [inline]
__blk_run_queue+0x1a4/0x380 block/blk-core.c:484
blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78
sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847
sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716
sg_write+0x64/0xa0 drivers/scsi/sg.c:622
__vfs_write+0xed/0x690 fs/read_write.c:485
kill_bdev:block_device:00000000e138492c
vfs_write+0x184/0x4c0 fs/read_write.c:549
ksys_write+0x107/0x240 fs/read_write.c:599
do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

We get 'alen' from command its type is int. If userspace passes a large
length we will get a negative 'alen'.

Switch n, alen, and rlen to u32.

Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Douglas Gilbert <[e-mail]>
Signed-off-by: Ye Bin <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/scsi_debug.c

···
 	unsigned char *cmd = scp->cmnd;
 	unsigned char *arr;
 	int host_no = devip->sdbg_host->shost->host_no;
-	int n, ret, alen, rlen;
 	int port_group_a, port_group_b, port_a, port_b;
+	u32 alen, n, rlen;
+	int ret;
 
 	alen = get_unaligned_be32(cmd + 6);
 	arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
···
 	 * - The constructed command length
 	 * - The maximum array size
 	 */
-	rlen = min_t(int, alen, n);
+	rlen = min(alen, n);
 	ret = fill_from_dev_buffer(scp, arr,
-			   min_t(int, rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
+			   min_t(u32, rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
 	kfree(arr);
 	return ret;
 }