> Hello, > > syzbot found the following issue on: > > HEAD commit: d665ea6e Merge tag 'for-linus-5.13-rc1' of git://git.kerne.. > git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing > console output: https://syzkaller.appspot.com/x/log.txt?x=148bff43d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f635d6ce17da8a68 > dashboard link: https://syzkaller.appspot.com/bug?extid=7336195c02c1bd2f64e1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16e963e1d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116eec2dd00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+7336195c02c1bd2f64e1@xxxxxxxxxxxxxxxxxxxxxxxxx > > usb 1-1: media controller created > dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. > cxusb: set interface failed > dvb-usb: bulk message failed: -22 (1/0) > DVB: Unable to find symbol mt352_attach() > dvb-usb: no frontend was attached by 'DViCO FusionHDTV DVB-T USB (LGZ201)' > dvbdev: DVB: registering new adapter (DViCO FusionHDTV DVB-T USB (LGZ201)) > usb 1-1: media controller created > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 7 at mm/vmalloc.c:2873 __vmalloc_node_range+0x769/0x970 mm/vmalloc.c:2873 > Modules linked in: > CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Workqueue: usb_hub_wq hub_event > RIP: 0010:__vmalloc_node_range+0x769/0x970 mm/vmalloc.c:2873 > Code: c7 04 24 00 00 00 00 eb 93 e8 93 b7 d9 ff 44 89 fa 44 89 f6 4c 89 ef e8 75 20 07 00 48 89 04 24 e9 be fb ff ff e8 77 b7 d9 ff <0f> 0b 48 c7 04 24 00 00 00 00 e9 63 ff ff ff e8 63 b7 d9 ff 8b 7c > RSP: 0018:ffffc9000007ee30 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffffffff8403d464 RCX: 0000000000000000 > RDX: ffff888100283680 RSI: ffffffff81673599 RDI: 0000000000000003 > RBP: 0000000000000001 R08: 0000000000000000 R09: 8000000000000163 > R10: ffffffff81672ed2 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffc90000000000 R14: dffffc0000000000 R15: 00000000ffffffff > FS: 0000000000000000(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fffeb9f7c40 CR3: 00000001033f2000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __vmalloc_node mm/vmalloc.c:2963 [inline] > vmalloc+0x67/0x80 mm/vmalloc.c:2996 > dvb_dmx_init+0xe4/0xb90 drivers/media/dvb-core/dvb_demux.c:1251 > dvb_usb_adapter_dvb_init+0x564/0x860 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:184 > dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:86 [inline] > dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:184 [inline] > dvb_usb_device_init.cold+0xc94/0x146e drivers/media/usb/dvb-usb/dvb-usb-init.c:308 > cxusb_probe+0x159/0x5e0 drivers/media/usb/dvb-usb/cxusb.c:1634 > usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 > really_probe+0x291/0xf60 drivers/base/dd.c:576 > driver_probe_device+0x298/0x410 drivers/base/dd.c:763 > __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 > bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 > __device_attach+0x228/0x4b0 drivers/base/dd.c:938 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 > device_add+0xbe0/0x2100 drivers/base/core.c:3319 > usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164 > usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 > usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 > really_probe+0x291/0xf60 drivers/base/dd.c:576 > driver_probe_device+0x298/0x410 drivers/base/dd.c:763 > __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 > bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 > __device_attach+0x228/0x4b0 drivers/base/dd.c:938 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 > device_add+0xbe0/0x2100 drivers/base/core.c:3319 > usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556 > hub_port_connect drivers/usb/core/hub.c:5276 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5416 [inline] > port_event drivers/usb/core/hub.c:5562 [inline] > hub_event+0x2357/0x4320 drivers/usb/core/hub.c:5644 > process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 > worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 > kthread+0x38c/0x460 kernel/kthread.c:313 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches Seems like vmalloc() is called with zero size passed: <snip> void *__vmalloc_node_range(unsigned long size, unsigned long align, unsigned long start, unsigned long end, gfp_t gfp_mask, pgprot_t prot, unsigned long vm_flags, int node, const void *caller) { struct vm_struct *area; void *addr; unsigned long real_size = size; unsigned long real_align = align; unsigned int shift = PAGE_SHIFT; 2873 if (WARN_ON_ONCE(!size)) return NULL; <snip> from the dvb_dmx_init() driver: <snip> int dvb_dmx_init(struct dvb_demux *dvbdemux) { int i; struct dmx_demux *dmx = &dvbdemux->dmx; dvbdemux->cnt_storage = NULL; dvbdemux->users = 0; 1251 dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter), <snip> dvbdemux->filternum)); -- Vlad Rezki
