Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5619 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:ihex_validate_fw include/linux/ihex.h:56 [inline] RIP: 0010:request_ihex_firmware.constprop.0+0x11e/0x250 include/linux/ihex.h:74 Code: 48 89 04 24 e8 d3 11 b8 00 4c 39 24 24 0f 82 94 00 00 00 e8 c4 11 b8 00 49 8d 7c 24 04 48 89 f8 48 89 fe 48 c1 e8 03 83 e6 07 <42> 8a 0c 38 49 8d 44 24 05 48 89 c2 48 c1 ea 03 40 38 f1 40 0f 9e RSP: 0018:ffffc9000459eec8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90019581000 RDX: 0000000000100000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880266558c0 R14: ffffc9000459efe8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123dda000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b68e365420 CR3: 0000000056492000 CR4: 00000000003526f0 Call Trace: emi26_load_firmware drivers/usb/misc/emi26.c:86 [inline] emi26_probe+0x13c/0xe30 drivers/usb/misc/emi26.c:232 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x30a3/0x4a60 drivers/usb/core/hub.c:5953 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ihex_validate_fw include/linux/ihex.h:56 [inline] RIP: 0010:request_ihex_firmware.constprop.0+0x11e/0x250 include/linux/ihex.h:74 Code: 48 89 04 24 e8 d3 11 b8 00 4c 39 24 24 0f 82 94 00 00 00 e8 c4 11 b8 00 49 8d 7c 24 04 48 89 f8 48 89 fe 48 c1 e8 03 83 e6 07 <42> 8a 0c 38 49 8d 44 24 05 48 89 c2 48 c1 ea 03 40 38 f1 40 0f 9e RSP: 0018:ffffc9000459eec8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90019581000 RDX: 0000000000100000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880266558c0 R14: ffffc9000459efe8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123dda000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b336fbff8 CR3: 000000007431e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 48 89 04 24 mov %rax,(%rsp) 4: e8 d3 11 b8 00 call 0xb811dc 9: 4c 39 24 24 cmp %r12,(%rsp) d: 0f 82 94 00 00 00 jb 0xa7 13: e8 c4 11 b8 00 call 0xb811dc 18: 49 8d 7c 24 04 lea 0x4(%r12),%rdi 1d: 48 89 f8 mov %rdi,%rax 20: 48 89 fe mov %rdi,%rsi 23: 48 c1 e8 03 shr $0x3,%rax 27: 83 e6 07 and $0x7,%esi * 2a: 42 8a 0c 38 mov (%rax,%r15,1),%cl <-- trapping instruction 2e: 49 8d 44 24 05 lea 0x5(%r12),%rax 33: 48 89 c2 mov %rax,%rdx 36: 48 c1 ea 03 shr $0x3,%rdx 3a: 40 38 f1 cmp %sil,%cl 3d: 40 rex 3e: 0f .byte 0xf 3f: 9e sahf