program syz-executor.3 not setting count and/or reply_len properly
------------[ cut here ]------------
WARNING: CPU: 2 PID: 5633 at lib/iov_iter.c:629 _copy_from_iter+0x2ae/0xf40 lib/iov_iter.c:629
Modules linked in:
CPU: 2 PID: 5633 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-02019-g89f5349e0673 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:_copy_from_iter+0x2ae/0xf40 lib/iov_iter.c:629
Code: 5d 41 5c 41 5d 41 5e 41 5f c3 e8 bd 81 75 fd be 79 02 00 00 48 c7 c7 a0 6b a6 8a e8 ac 11 b0 fd e9 55 fe ff ff e8 a2 81 75 fd <0f> 0b 45 31 ff eb 8b e8 96 81 75 fd 31 ff 89 ee e8 fd 7d 75 fd 40
RSP: 0018:ffffc9000c8bf618 EFLAGS: 00010212
RAX: 00000000000018d4 RBX: 0000000000000000 RCX: ffffc90002629000
RDX: 0000000000040000 RSI: ffffffff840ad86e RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000f6
R13: ffffc9000c8bf818 R14: 0000000000000000 R15: 00000000000000f6
FS:  00007fe5a9880700(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f75f3fad988 CR3: 00000000765d5000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 copy_page_from_iter lib/iov_iter.c:754 [inline]
 copy_page_from_iter+0x9f/0x110 lib/iov_iter.c:743
 bio_copy_from_iter block/blk-map.c:55 [inline]
 bio_copy_user_iov block/blk-map.c:210 [inline]
 blk_rq_map_user_iov+0xb5d/0x16e0 block/blk-map.c:661
 blk_rq_map_user block/blk-map.c:690 [inline]
 blk_rq_map_user_io+0x1cd/0x200 block/blk-map.c:723
 sg_start_req drivers/scsi/sg.c:1807 [inline]
 sg_common_write.constprop.0+0xdcd/0x1e00 drivers/scsi/sg.c:803
 sg_write.part.0+0x75d/0xd60 drivers/scsi/sg.c:707
 sg_write+0x88/0xe0 drivers/scsi/sg.c:226
 vfs_write+0x2db/0xdd0 fs/read_write.c:582
 ksys_write+0x12b/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe5a8a8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe5a9880168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe5a8babf80 RCX: 00007fe5a8a8c0f9
RDX: 0000000000000120 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007fe5a8ae7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdcfc46d9f R14: 00007fe5a9880300 R15: 0000000000022000
 </TASK>