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2002:a05:6808:220f:b0:49f:a87e:2316 with SMTP id 5614622812f47-4ad8792b9f5mr679115b6e.31.1785383608172; Wed, 29 Jul 2026 20:53:28 -0700 (PDT) Date: Wed, 29 Jul 2026 20:53:28 -0700 In-Reply-To: <6a68b458.4c659fcc.19cd90.0023.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6acab8.57649fcc.360844.000f.GAE@google.com> Subject: Re: [syzbot] [usb?] general protection fault in f_midi2_free_ep From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: fc46aed51f62 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=142cd9b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb17729fb04b1e3a dashboard link: https://syzkaller.appspot.com/bug?extid=3451bfda4264c512ef27 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ab248e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=118ab8c6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/955cec68f017/disk-fc46aed5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a9cb903c7039/vmlinux-fc46aed5.xz kernel image: https://storage.googleapis.com/syzbot-assets/54a5b24a2b25/bzImage-fc46aed5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3451bfda4264c512ef27@syzkaller.appspotmail.com Oops: gen[ 99.553665][ T5620] Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] CPU: 0 UID: 0 PID: 5620 Comm: syz-executor121 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 23 9d e7 fa 41 bc 70 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 d5 RSP: 0018:ffffc900040df978 EFLAGS: 00010206 RAX: 00000000000000ee RBX: ffff8880446f4000 RCX: ffff888038dcdd00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff8faf9837 R09: 1ffffffff1f5f306 R10: dffffc0000000000 R11: fffffbfff1f5f307 R12: 0000000000000770 R13: dffffc0000000000 R14: ffff8880446f4128 R15: dffffc0000000000 FS: 000055558593b400(0000) GS:ffff888125c41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005653470e07a0 CR3: 0000000042ae2000 CR4: 00000000003526f0 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_unbind+0xa0/0x1b0 drivers/usb/gadget/configfs.c:1846 gadget_unbind_driver+0x1cb/0x410 drivers/usb/gadget/udc/core.c:1724 device_remove drivers/base/dd.c:616 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372 driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1435 bus_remove_driver+0x229/0x320 drivers/base/bus.c:832 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1784 unregister_gadget drivers/usb/gadget/configfs.c:263 [inline] gadget_dev_desc_UDC_store+0x17a/0x2f0 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x33a/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 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: 0033:0x7fd367807789 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd35b431c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 6769666e6f632f2e RCX: 00007fd367807789 RDX: 0000000000000001 RSI: 00002000000004c0 RDI: 0000000000000004 RBP: 6e6f635f796d2f2e R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffd35b43338 R13: 431bde82d7b634db R14: 00007fd36789ac40 R15: 0000000000000002 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 23 9d e7 fa 41 bc 70 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 d5 RSP: 0018:ffffc900040df978 EFLAGS: 00010206 RAX: 00000000000000ee RBX: ffff8880446f4000 RCX: ffff888038dcdd00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff8faf9837 R09: 1ffffffff1f5f306 R10: dffffc0000000000 R11: fffffbfff1f5f307 R12: 0000000000000770 R13: dffffc0000000000 R14: ffff8880446f4128 R15: dffffc0000000000 FS: 000055558593b400(0000) GS:ffff888125c41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005653470e07a0 CR3: 0000000042ae2000 CR4: 00000000003526f0 ---------------- 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 23 9d e7 fa call 0xfae79d38 15: 41 bc 70 07 00 00 mov $0x770,%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: d5 .byte 0xd5 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.