KMSAN: uninit-value in alauda_check

KMSAN: uninit-value in alauda_check_media
Status: upstream: reported C repro on 2019/10/07 19:39
Reported-by: syzbot+e7d46eb426883fb97efd@syzkaller.appspotmail.com
First crash: 280d, last: 268d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2019/10/11 11:51	13m	glider@google.com		https://github.com/google/kmsan.git master	report log
2019/10/11 11:23	21m	jaskaransingh7654321@gmail.com	patch	https://github.com/google/kmsan.git 1e76a3e5	report log

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
CPU: 0 PID: 12279 Comm: usb-storage 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
 alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
 alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
 usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606
 usb_stor_transparent_scsi_command+0x5d/0x70 drivers/usb/storage/protocol.c:108
 usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----status@alauda_check_media
Variable was created at:
 alauda_check_media+0x8e/0x3310 drivers/usb/storage/alauda.c:454
 alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
=====================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 12279 Comm: usb-storage Tainted: G    B             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
 panic+0x3c9/0xc1e kernel/panic.c:219
 kmsan_report+0x2a2/0x2b0 mm/kmsan/kmsan_report.c:131
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
 alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
 alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
 usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606
 usb_stor_transparent_scsi_command+0x5d/0x70 drivers/usb/storage/protocol.c:108
 usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (11):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kmsan-gce	2019/10/05 07:09	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report	syz	C	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/16 09:11	https://github.com/google/kmsan.git master	c2453450	d4ea592f	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/11 19:07	https://github.com/google/kmsan.git master	dde80316	426631dd	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/10 01:30	https://github.com/google/kmsan.git master	dc327eca	c4b9981b	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/09 16:21	https://github.com/google/kmsan.git master	eff1487c	312c6a5a	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/08 16:22	https://github.com/google/kmsan.git master	cebb918b	b1ebbfef	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/06 23:03	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/06 18:35	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/06 06:53	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/05 06:28	https://github.com/google/kmsan.git master	1e76a3e5	f3f7d9c8	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net
ci-upstream-kmsan-gce	2019/10/04 16:43	https://github.com/google/kmsan.git master	1e76a3e5	3e1e84d4	.config	log	report			gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, usb-storage@lists.one-eyed-alien.net