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Message-ID: <6ae06214.6200f071.51519.0f44.GAE@google.com> Subject: [syzbot ci] Re: gs_usb: fixes From: syzbot ci To: eric@evenchick.com, kernel@pengutronix.de, linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, mailhol@kernel.org, max@schneidersoft.net, mkl@pengutronix.de, pfink@christ-es.de, stable@vger.kernel.org, wg@grandegger.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v3] gs_usb: fixes https://lore.kernel.org/all/20261026-gs_usb-fixes-v3-0-3a68f1f62813@pengutronix.de * [PATCH v3 1/4] can: gs_usb: gs_can_start_xmit(): don't leak uninitialized memory over USB * [PATCH v3 2/4] can: gs_usb: gs_usb_probe(): init netdev completely before register_candev() * [PATCH v3 3/4] can: gs_usb: gs_usb_receive_bulk_callback(): check for overflow flag if SKB allocation fails * [PATCH v3 4/4] can: gs_usb: gs_usb_receive_bulk_callback(): add missing call to can_rx_offload_irq_finish and found the following issue: general protection fault in can_rx_offload_del Full report is available here: https://ci.syzbot.org/series/0c1fc4c5-6a50-43da-a45c-fbc3a8685c3d *** general protection fault in can_rx_offload_del tree: axboe URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux.git base: 734bef548a96e8774d6eef5dfa2026c6edc4e80b arch: amd64 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/03f4b948-ccf7-4d18-8177-b9847267246c/config syz repro: https://ci.syzbot.org/findings/e4142ca3-3d98-40ef-95df-e6f3ad59fd4e/syz_repro gs_usb 1-1:0.0: Couldn't get bit timing const for channel 0 (-EPROTO) Oops: general protection fault, probably for non-canonical address 0xdffffc000000005f: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000002f8-0x00000000000002ff] CPU: 1 UID: 0 PID: 5651 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: usb_hub_wq hub_event RIP: 0010:__netif_napi_del include/linux/netdevice.h:3007 [inline] RIP: 0010:netif_napi_del include/linux/netdevice.h:3026 [inline] RIP: 0010:can_rx_offload_del+0x3c/0x1e0 drivers/net/can/dev/rx-offload.c:423 Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 9c 5f fc fa 4c 8d a3 d0 00 00 00 49 89 dd 4c 8d b3 00 01 00 00 4c 89 f3 48 c1 eb 03 <80> 3c 2b 00 74 08 4c 89 f7 e8 26 57 6d fb 41 bf 38 0e 00 00 49 8b RSP: 0018:ffffc90006a4eb30 EFLAGS: 00010206 RAX: ffffffff86cbe694 RBX: 000000000000005f RCX: ffff8881ba5cbc00 RDX: 0000000000000000 RSI: 000000000000009e RDI: 00000000000001f9 RBP: dffffc0000000000 R08: ffffc90006a4e6c7 R09: 1ffff92000d49cd8 R10: dffffc0000000000 R11: fffff52000d49cd9 R12: 00000000000002c9 R13: 00000000000001f9 R14: 00000000000002f9 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8882a7ca4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd875c71220 CR3: 0000000115016000 CR4: 00000000000006f0 Call Trace: gs_destroy_candev drivers/net/can/usb/gs_usb.c:1510 [inline] gs_usb_probe+0x2201/0x2730 drivers/net/can/usb/gs_usb.c:1639 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 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 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:623 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1bb5/0x2260 drivers/usb/core/message.c:2274 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 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 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:503 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:623 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2713 hub_port_connect drivers/usb/core/hub.c:5585 [inline] hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] port_event drivers/usb/core/hub.c:5889 [inline] hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5971 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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:__netif_napi_del include/linux/netdevice.h:3007 [inline] RIP: 0010:netif_napi_del include/linux/netdevice.h:3026 [inline] RIP: 0010:can_rx_offload_del+0x3c/0x1e0 drivers/net/can/dev/rx-offload.c:423 Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 9c 5f fc fa 4c 8d a3 d0 00 00 00 49 89 dd 4c 8d b3 00 01 00 00 4c 89 f3 48 c1 eb 03 <80> 3c 2b 00 74 08 4c 89 f7 e8 26 57 6d fb 41 bf 38 0e 00 00 49 8b RSP: 0018:ffffc90006a4eb30 EFLAGS: 00010206 RAX: ffffffff86cbe694 RBX: 000000000000005f RCX: ffff8881ba5cbc00 RDX: 0000000000000000 RSI: 000000000000009e RDI: 00000000000001f9 RBP: dffffc0000000000 R08: ffffc90006a4e6c7 R09: 1ffff92000d49cd8 R10: dffffc0000000000 R11: fffff52000d49cd9 R12: 00000000000002c9 R13: 00000000000001f9 R14: 00000000000002f9 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8882a7ca4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f58953fcfe0 CR3: 000000000fb48000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 48 89 fb mov %rdi,%rbx 3: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp a: fc ff df d: e8 9c 5f fc fa call 0xfafc5fae 12: 4c 8d a3 d0 00 00 00 lea 0xd0(%rbx),%r12 19: 49 89 dd mov %rbx,%r13 1c: 4c 8d b3 00 01 00 00 lea 0x100(%rbx),%r14 23: 4c 89 f3 mov %r14,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 80 3c 2b 00 cmpb $0x0,(%rbx,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 26 57 6d fb call 0xfb6d575e 38: 41 bf 38 0e 00 00 mov $0xe38,%r15d 3e: 49 rex.WB 3f: 8b .byte 0x8b *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.