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SubjectKMSAN: uninit-value in read_rio

syzbot found the following crash on:

HEAD commit: 1e76a3e5 kmsan: replace __GFP_NO_KMSAN_SHADOW with kmsan_i..
git tree: master
console output:
kernel config:
dashboard link:
compiler: clang version 9.0.0 (/home/glider/llvm/clang

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

usb 5-1: Rio opened.
BUG: KMSAN: uninit-value in __vfs_read+0x1a9/0xc90 fs/read_write.c:425
CPU: 1 PID: 12169 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
read_rio+0x55d/0x860 drivers/usb/misc/rio500.c:404
__vfs_read+0x1a9/0xc90 fs/read_write.c:425
vfs_read+0x359/0x6f0 fs/read_write.c:461
ksys_read+0x265/0x430 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read+0x92/0xb0 fs/read_write.c:595
__x64_sys_read+0x4a/0x70 fs/read_write.c:595
do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
RIP: 0033:0x459a29
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd0a6183c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a29
RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd0a61846d4
R13: 00000000004c7066 R14: 00000000004dc8c8 R15: 00000000ffffffff

Local variable description: ----partial@read_rio
Variable was created at:
read_rio+0xff/0x860 drivers/usb/misc/rio500.c:360
__vfs_read+0x1a9/0xc90 fs/read_write.c:425

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