gspca_cpia1: usb_control_msg 03, error -32 gspca_cpia1: usb_control_msg a1, error -32 gspca_cpia1: usb_control_msg a1, error -32 gspca_cpia1: usb_control_msg a1, error -32 gspca_cpia1: usb_control_msg 03, error -71 gspca_cpia1: usb_control_msg 03, error -71 ================================================================== BUG: KASAN: stack-out-of-bounds in find_last_bit include/linux/find.h:382 [inline] BUG: KASAN: stack-out-of-bounds in set_flicker+0x101c/0x1190 drivers/media/usb/gspca/cpia1.c:1033 Read of size 8 at addr ffffc900001b6f78 by task kworker/1:1/25 CPU: 1 PID: 25 Comm: kworker/1:1 Not tainted 6.5.0-rc6-syzkaller-00158-g895ed7eb263d-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 find_last_bit include/linux/find.h:382 [inline] set_flicker+0x101c/0x1190 drivers/media/usb/gspca/cpia1.c:1033 sd_s_ctrl+0x2c6/0xbf0 drivers/media/usb/gspca/cpia1.c:1787 __v4l2_ctrl_handler_setup+0x511/0x710 drivers/media/v4l2-core/v4l2-ctrls-core.c:2481 v4l2_ctrl_handler_setup drivers/media/v4l2-core/v4l2-ctrls-core.c:2498 [inline] v4l2_ctrl_handler_setup+0x50/0xa0 drivers/media/v4l2-core/v4l2-ctrls-core.c:2490 gspca_set_default_mode drivers/media/usb/gspca/gspca.c:908 [inline] gspca_dev_probe2+0xdd6/0x1b20 drivers/media/usb/gspca/gspca.c:1541 gspca_dev_probe+0x18b/0x270 drivers/media/usb/gspca/gspca.c:1610 usb_probe_interface+0x307/0x930 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x234/0xc90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:798 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828 __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:956 bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1028 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 device_add+0x11f1/0x1b40 drivers/base/core.c:3625 usb_set_configuration+0x10cb/0x1c40 drivers/usb/core/message.c:2207 usb_generic_driver_probe+0xca/0x130 drivers/usb/core/generic.c:238 usb_probe_device+0xda/0x2c0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x234/0xc90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:798 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828 __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:956 bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1028 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 device_add+0x11f1/0x1b40 drivers/base/core.c:3625 usb_new_device+0xd80/0x1960 drivers/usb/core/hub.c:2589 hub_port_connect drivers/usb/core/hub.c:5440 [inline] hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] port_event drivers/usb/core/hub.c:5740 [inline] hub_event+0x2e62/0x4f30 drivers/usb/core/hub.c:5822 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 worker_thread+0x687/0x1110 kernel/workqueue.c:2751 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to stack of task kworker/1:1/25 and is located at offset 32 in frame: set_flicker+0x0/0x1190 drivers/media/usb/gspca/cpia1.c:577 This frame has 1 object: [32, 36) 'currentexp' The buggy address belongs to the virtual mapping at [ffffc900001b0000, ffffc900001b9000) created by: kernel_clone+0xfc/0x820 kernel/fork.c:2912 The buggy address belongs to the physical page: page:ffffea00040b97c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102e5f flags: 0x200000000000000(node=0|zone=2) page_type: 0xffffffff() raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 2379209355, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10e1/0x2fd0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_pages_node include/linux/gfp.h:260 [inline] vm_area_alloc_pages mm/vmalloc.c:3061 [inline] __vmalloc_area_node mm/vmalloc.c:3135 [inline] __vmalloc_node_range+0x625/0x1540 mm/vmalloc.c:3316 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1113 [inline] copy_process+0x13de/0x7300 kernel/fork.c:2330 kernel_clone+0xfc/0x820 kernel/fork.c:2912 kernel_thread+0xc0/0x100 kernel/fork.c:2974 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x4fc/0x7b0 kernel/kthread.c:747 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 page_owner free stack trace missing Memory state around the buggy address: ffffc900001b6e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900001b6e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900001b6f00: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 ^ ffffc900001b6f80: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900001b7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================