Vito Caputo
06f4d7ae2c
commit ca8f245f28 upstream.
Don't use uninitialized ircode[] in cxusb_rc_query() when
cxusb_ctrl_msg() fails to populate its contents.
syzbot reported:
dvb-usb: bulk message failed: -22 (1/-30591)
=====================================================
BUG: KMSAN: uninit-value in ir_lookup_by_scancode drivers/media/rc/rc-main.c:494 [inline]
BUG: KMSAN: uninit-value in rc_g_keycode_from_table drivers/media/rc/rc-main.c:582 [inline]
BUG: KMSAN: uninit-value in rc_keydown+0x1a6/0x6f0 drivers/media/rc/rc-main.c:816
CPU: 1 PID: 11436 Comm: kworker/1:2 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events dvb_usb_read_remote_control
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
bsearch+0x1dd/0x250 lib/bsearch.c:41
ir_lookup_by_scancode drivers/media/rc/rc-main.c:494 [inline]
rc_g_keycode_from_table drivers/media/rc/rc-main.c:582 [inline]
rc_keydown+0x1a6/0x6f0 drivers/media/rc/rc-main.c:816
cxusb_rc_query+0x2e1/0x360 drivers/media/usb/dvb-usb/cxusb.c:548
dvb_usb_read_remote_control+0xf9/0x290 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261
process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
kthread+0x4b5/0x4f0 kernel/kthread.c:256
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline]
kmsan_internal_chain_origin+0xd2/0x170 mm/kmsan/kmsan.c:314
__msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:184
rc_g_keycode_from_table drivers/media/rc/rc-main.c:583 [inline]
rc_keydown+0x2c4/0x6f0 drivers/media/rc/rc-main.c:816
cxusb_rc_query+0x2e1/0x360 drivers/media/usb/dvb-usb/cxusb.c:548
dvb_usb_read_remote_control+0xf9/0x290 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261
process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
kthread+0x4b5/0x4f0 kernel/kthread.c:256
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
Local variable description: ----ircode@cxusb_rc_query
Variable was created at:
cxusb_rc_query+0x4d/0x360 drivers/media/usb/dvb-usb/cxusb.c:543
dvb_usb_read_remote_control+0xf9/0x290 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261
Signed-off-by: Vito Caputo <vcaputo@pengaru.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.