configfs-gadget.g1 gadget.0: afunc_bind:1251 Error! Oops: general protection fault, probably for non-canonical address 0xdffffc00000000e6: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000730-0x0000000000000737] CPU: 1 UID: 0 PID: 6577 Comm: syz.2.142 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_free_ep+0x52/0x2f0 drivers/usb/gadget/function/f_midi2.c:1208 Code: 4c 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 83 ee 63 fa 41 bc 30 07 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 89 44 24 30 <0f> b6 04 28 84 c0 0f 85 5d 02 00 00 41 8b 1c 24 31 ff 89 de e8 25 RSP: 0018:ffffc900045a7708 EFLAGS: 00010212 RAX: 00000000000000e6 RBX: ffff888050eb8000 RCX: 0000000000080000 RDX: ffffc900104b4000 RSI: 0000000000027d76 RDI: 0000000000027d77 RBP: dffffc0000000000 R08: ffffffff90579d37 R09: 1ffffffff20af3a6 R10: dffffc0000000000 R11: fffffbfff20af3a7 R12: 0000000000000730 R13: dffffc0000000000 R14: ffff888050eb8128 R15: dffffc0000000000 FS: 00007f687e5c66c0(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f786365b368 CR3: 0000000074a15000 CR4: 0000000000350ef0 Call Trace: f_midi2_unbind+0x9b/0x340 drivers/usb/gadget/function/f_midi2.c:2066 purge_configs_funcs+0x248/0x3d0 drivers/usb/gadget/configfs.c:1600 configfs_composite_bind+0x106d/0x1410 drivers/usb/gadget/configfs.c:1824 gadget_bind_driver+0x2ca/0x9e0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __driver_attach+0x339/0x600 drivers/base/dd.c:1292 bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x345/0x670 drivers/base/bus.c:763 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x1c9/0x2f0 drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x337/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f687d79e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f687e5c6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f687da26090 RCX: 00007f687d79e019 RDX: 000000000000000c RSI: 0000200000001100 RDI: 0000000000000009 RBP: 00007f687d83500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f687da26128 R14: 00007f687da26090 R15: 00007ffe034ffc18 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_free_ep+0x52/0x2f0 drivers/usb/gadget/function/f_midi2.c:1208 Code: 4c 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 83 ee 63 fa 41 bc 30 07 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 89 44 24 30 <0f> b6 04 28 84 c0 0f 85 5d 02 00 00 41 8b 1c 24 31 ff 89 de e8 25 RSP: 0018:ffffc900045a7708 EFLAGS: 00010212 RAX: 00000000000000e6 RBX: ffff888050eb8000 RCX: 0000000000080000 RDX: ffffc900104b4000 RSI: 0000000000027d76 RDI: 0000000000027d77 RBP: dffffc0000000000 R08: ffffffff90579d37 R09: 1ffffffff20af3a6 R10: dffffc0000000000 R11: fffffbfff20af3a7 R12: 0000000000000730 R13: dffffc0000000000 R14: ffff888050eb8128 R15: dffffc0000000000 FS: 00007f687e5c66c0(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000271000 CR3: 0000000074a15000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 4c 89 f0 mov %r14,%rax 3: 48 c1 e8 03 shr $0x3,%rax 7: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) b: 74 08 je 0x15 d: 4c 89 f7 mov %r14,%rdi 10: e8 83 ee 63 fa call 0xfa63ee98 15: 41 bc 30 07 00 00 mov $0x730,%r12d 1b: 4d 03 26 add (%r14),%r12 1e: 4c 89 e0 mov %r12,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 48 89 44 24 30 mov %rax,0x30(%rsp) * 2a: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 5d 02 00 00 jne 0x293 36: 41 8b 1c 24 mov (%r12),%ebx 3a: 31 ff xor %edi,%edi 3c: 89 de mov %ebx,%esi 3e: e8 .byte 0xe8 3f: 25 .byte 0x25