Hello, syzbot found the following issue on: HEAD commit: 3644e2d2 mm/filemap: fix infinite loop in generic_file_buf.. 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=1669d8c5500000 kernel config: https://syzkaller.appspot.com/x/.config?x=ff698e602d15ad28 dashboard link: https://syzkaller.appspot.com/bug?extid=3f1ca6a6fec34d601788 compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3f1ca6a6fec34d601788@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: out-of-bounds in ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:636 [inline] BUG: KASAN: out-of-bounds in ath9k_hif_usb_rx_cb+0xdab/0x1020 drivers/net/wireless/ath/ath9k/hif_usb.c:680 Read of size 4 at addr ffff888112be40b8 by task systemd-journal/2634 CPU: 0 PID: 2634 Comm: systemd-journal Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:636 [inline] ath9k_hif_usb_rx_cb+0xdab/0x1020 drivers/net/wireless/ath/ath9k/hif_usb.c:680 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x38c/0x430 drivers/usb/core/hcd.c:1728 dummy_timer+0x11f4/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1971 call_timer_fn+0x1a5/0x690 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x692/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1744 __do_softirq+0x1b7/0x9c5 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x119/0x1b0 kernel/softirq.c:420 irq_exit_rcu+0x5/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:devkmsg_read+0x3df/0x750 kernel/printk/printk.c:754 Code: 01 80 3c 02 00 0f 85 19 03 00 00 48 c7 c7 c0 95 66 87 4c 89 6d 00 e8 00 0d 97 04 e8 0b 4b 00 00 e8 b6 4e 1c 00 fb 48 8b 2c 24 <4c> 89 ff 48 c7 c3 ea ff ff ff 48 89 ee e8 df 96 16 00 49 39 ef 77 RSP: 0018:ffffc90000247d68 EFLAGS: 00000202 RAX: 0000000001f89e25 RBX: ffff88810ef320f8 RCX: ffffffff8126e037 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8129b43a RBP: 0000000000002000 R08: 0000000000000001 R09: ffffffff8a02c65f R10: fffffbfff14058cb R11: 000000000000005c R12: 1ffff92000048fb2 R13: 000000000000ab98 R14: ffff88810ef30068 R15: 000000000000009a vfs_read+0x1b5/0x570 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7ffbb8d4f210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffdc194c458 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffdc194eed0 RCX: 00007ffbb8d4f210 RDX: 0000000000002000 RSI: 00007ffdc194ccd0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00007ffdc19c20f0 R10: 000000000002c96e R11: 0000000000000246 R12: 00007ffdc194ccd0 R13: 00007ffdc194ee28 R14: 00005646a13bb958 R15: 0005b6f3706fc2a9 Allocated by task 31546: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2889 [inline] __kmalloc_node_track_caller+0x1a2/0x340 mm/slub.c:4493 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5c0 net/core/skbuff.c:210 __netdev_alloc_skb+0x6b/0x3b0 net/core/skbuff.c:442 netdev_alloc_skb include/linux/skbuff.h:2831 [inline] dev_alloc_skb include/linux/skbuff.h:2844 [inline] ath6kl_usb_post_recv_transfers.constprop.0+0x55/0x400 drivers/net/wireless/ath/ath6kl/usb.c:422 ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:492 [inline] hif_start drivers/net/wireless/ath/ath6kl/usb.c:690 [inline] ath6kl_usb_power_on+0x8a/0x150 drivers/net/wireless/ath/ath6kl/usb.c:1049 ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline] ath6kl_core_init drivers/net/wireless/ath/ath6kl/core.c:97 [inline] ath6kl_core_init+0x1ae/0x1170 drivers/net/wireless/ath/ath6kl/core.c:66 ath6kl_usb_probe+0xc3d/0x11f0 drivers/net/wireless/ath/ath6kl/usb.c:1155 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x2b1/0xe40 drivers/base/dd.c:561 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:745 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 usb_set_configuration+0x113c/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+0x2b1/0xe40 drivers/base/dd.c:561 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:745 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 usb_new_device.cold+0x725/0x1057 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x15c0 kernel/workqueue.c:2275 process_scheduled_works kernel/workqueue.c:2337 [inline] worker_thread+0x82b/0x1120 kernel/workqueue.c:2423 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff888112be4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 184 bytes inside of 8192-byte region [ffff888112be4000, ffff888112be6000) The buggy address belongs to the page: page:0000000066b7dcb8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112be0 head:0000000066b7dcb8 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000122 ffff888100042280 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888112be3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888112be4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888112be4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888112be4100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112be4180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- This report is generated by a bot. 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