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UBSAN: shift-out-of-bounds in set_flicker

Status: upstream: reported syz repro on 2023/11/26 06:40
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+917ee0d4e8624bfe4e70@syzkaller.appspotmail.com
First crash: 159d, last: 159d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/11/26 linux-6.1.y (ToT) 69e434a1cb21 C [report] INFO: rcu detected stall in corrupted
2023/11/26 upstream (ToT) 090472ed9c92 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in set_flicker usb media syz 5 180d 260d 25/26 fixed on 2023/12/21 03:45
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2023/12/28 06:42 9h28m fix candidate upstream job log (1)

Sample crash report:
gspca_cpia1: usb_control_msg 03, error -71
================================================================================
UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27
shift exponent 245 is too large for 32-bit type 'int'
CPU: 0 PID: 111 Comm: kworker/0:2 Not tainted 6.1.63-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Workqueue: usb_hub_wq hub_event
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2f4/0x36c lib/ubsan.c:321
 set_flicker+0x11d8/0x12c0 drivers/media/usb/gspca/cpia1.c:1031
 sd_s_ctrl+0x8ac/0x1714 drivers/media/usb/gspca/cpia1.c:1782
 __v4l2_ctrl_handler_setup+0x570/0x674 drivers/media/v4l2-core/v4l2-ctrls-core.c:2218
 v4l2_ctrl_handler_setup+0x58/0x94 drivers/media/v4l2-core/v4l2-ctrls-core.c:2235
 gspca_set_default_mode drivers/media/usb/gspca/gspca.c:908 [inline]
 gspca_dev_probe2+0x814/0x1084 drivers/media/usb/gspca/gspca.c:1541
 gspca_dev_probe+0x140/0x210 drivers/media/usb/gspca/gspca.c:1610
 sd_probe+0x38/0x48 drivers/media/usb/gspca/benq.c:258
 usb_probe_interface+0x500/0x984 drivers/usb/core/driver.c:396
 really_probe+0x394/0xacc drivers/base/dd.c:639
 __driver_probe_device+0x194/0x3b4 drivers/base/dd.c:785
 driver_probe_device+0x78/0x330 drivers/base/dd.c:815
 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:943
 bus_for_each_drv+0x158/0x1e0 drivers/base/bus.c:427
 __device_attach+0x2f0/0x480 drivers/base/dd.c:1015
 device_initial_probe+0x24/0x34 drivers/base/dd.c:1064
 bus_probe_device+0xbc/0x1c8 drivers/base/bus.c:487
 device_add+0xae0/0xef4 drivers/base/core.c:3664
 usb_set_configuration+0x15c0/0x1b40 drivers/usb/core/message.c:2165
 usb_generic_driver_probe+0x8c/0x148 drivers/usb/core/generic.c:238
 usb_probe_device+0x120/0x25c drivers/usb/core/driver.c:293
 really_probe+0x394/0xacc drivers/base/dd.c:639
 __driver_probe_device+0x194/0x3b4 drivers/base/dd.c:785
 driver_probe_device+0x78/0x330 drivers/base/dd.c:815
 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:943
 bus_for_each_drv+0x158/0x1e0 drivers/base/bus.c:427
 __device_attach+0x2f0/0x480 drivers/base/dd.c:1015
 device_initial_probe+0x24/0x34 drivers/base/dd.c:1064
 bus_probe_device+0xbc/0x1c8 drivers/base/bus.c:487
 device_add+0xae0/0xef4 drivers/base/core.c:3664
 usb_new_device+0x904/0x142c drivers/usb/core/hub.c:2583
 hub_port_connect drivers/usb/core/hub.c:5434 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5574 [inline]
 port_event drivers/usb/core/hub.c:5730 [inline]
 hub_event+0x23f4/0x4360 drivers/usb/core/hub.c:5812
 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292
 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
================================================================================
input: cpia1 as /devices/platform/dummy_hcd.0/usb1/1-1/input/input2
usb 1-1: USB disconnect, device number 19
usb 1-1: new high-speed USB device number 20 using dummy_hcd
usb 1-1: New USB device found, idVendor=0553, idProduct=0002, bcdDevice=b0.11
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
gspca_main: cpia1-2.14.0 probing 0553:0002
cpia1 1-1:0.0: unexpected state after lo power cmd: 01
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 01, error -32
gspca_cpia1: usb_control_msg 01, error -32
gspca_cpia1: usb_control_msg 01, error -32
gspca_cpia1: usb_control_msg 01, error -32
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
cpia1 1-1:0.0: unexpected state after hi power cmd: f5
cpia1: probe of 1-1:0.0 failed with error -5
usb 1-1: USB disconnect, device number 20
usb 1-1: new high-speed USB device number 21 using dummy_hcd
usb 1-1: New USB device found, idVendor=0553, idProduct=0002, bcdDevice=b0.11
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
gspca_main: cpia1-2.14.0 probing 0553:0002
cpia1 1-1:0.0: unexpected state after lo power cmd: 01
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
gspca_cpia1: usb_control_msg 03, error -32
cpia1 1-1:0.0: unexpected systemstate: 01

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/26 06:40 linux-6.1.y 69e434a1cb21 5b429f39 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 UBSAN: shift-out-of-bounds in set_flicker
* Struck through repros no longer work on HEAD.