================================================================== BUG: KASAN: use-after-free in ar5523_cmd_tx_cb+0x220/0x240 drivers/net/wireless/ath/ar5523/ar5523.c:228 Read of size 8 at addr ffff88811a82f450 by task udevd/1179 CPU: 1 PID: 1179 Comm: udevd Not tainted 6.0.0-rc4-syzkaller-00055-g6690986da1e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 ar5523_cmd_tx_cb+0x220/0x240 drivers/net/wireless/ath/ar5523/ar5523.c:228 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1671 usb_hcd_giveback_urb+0x380/0x430 drivers/usb/core/hcd.c:1754 dummy_timer+0x11ff/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1c0/0x9a9 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x113/0x170 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:774 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0xcb/0x140 kernel/rcu/tree.c:757 Code: 03 80 3c 02 00 75 72 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 18 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 75 5a 48 8b 53 70 01 00 00 00 48 85 d5 74 0c 65 ff 0d a4 96 d1 7e 74 21 5b 5d c3 RSP: 0018:ffffc900005a7900 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffffff87a9eac0 RCX: ffffffff812a1f81 RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffffffff87a9eb30 RBP: 0000000000000002 R08: 0000000000000000 R09: ffffffff88de98d7 R10: fffffbfff11bd31a R11: 0000000000000000 R12: 0000000000000001 R13: ffff8881000674d8 R14: ffff88810c9a4740 R15: ffff88811c9ead40 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x560/0x780 kernel/locking/lockdep.c:5677 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:389 [inline] kernfs_iop_permission+0xf1/0x130 fs/kernfs/inode.c:294 do_inode_permission fs/namei.c:458 [inline] inode_permission.part.0+0x3d6/0x670 fs/namei.c:525 inode_permission+0x3c/0x140 fs/namei.c:478 may_open+0x11e/0x420 fs/namei.c:3185 do_open fs/namei.c:3555 [inline] path_openat+0xe9a/0x28f0 fs/namei.c:3691 do_filp_open+0x1b6/0x400 fs/namei.c:3718 do_sys_openat2+0x16d/0x4c0 fs/open.c:1311 do_sys_open fs/open.c:1327 [inline] __do_sys_openat fs/open.c:1343 [inline] __se_sys_openat fs/open.c:1338 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1338 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f66caed9697 Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f RSP: 002b:00007ffc5d5b0d20 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00005577641c0c10 RCX: 00007f66caed9697 RDX: 0000000000080000 RSI: 00007ffc5d5b0e58 RDI: 00000000ffffff9c RBP: 00007ffc5d5b0e58 R08: 0000000000000008 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000 R13: 00005577641c0c10 R14: 0000000000000001 R15: 0000000000000000 The buggy address belongs to the physical page: page:ffffea00046a0bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a82f flags: 0x200000000000000(node=0|zone=2) raw: 0200000000000000 0000000000000000 ffffffff00000101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Unmovable, gfp_mask 0x140dc0(GFP_USER|__GFP_COMP|__GFP_ZERO), pid 1139, tgid 1139 (kworker/1:3), ts 274355412780, free_ts 276396026806 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x11cc/0x2a20 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 kmalloc_order+0x34/0xf0 mm/slab_common.c:930 kmalloc_order_trace+0x13/0x120 mm/slab_common.c:946 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] wiphy_new_nm+0x6fc/0x2090 net/wireless/core.c:440 ieee80211_alloc_hw_nm+0x44b/0x2450 net/mac80211/main.c:668 ieee80211_alloc_hw include/net/mac80211.h:4511 [inline] ar5523_probe+0x11a/0x1d10 drivers/net/wireless/ath/ar5523/ar5523.c:1595 usb_probe_interface+0x30b/0x7f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:560 [inline] really_probe+0x249/0xb90 drivers/base/dd.c:639 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808 __device_attach_driver+0x1d0/0x2e0 drivers/base/dd.c:936 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x1e4/0x530 drivers/base/dd.c:1008 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5d2/0xb80 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x420 mm/page_alloc.c:3476 device_release+0x9f/0x240 drivers/base/core.c:2330 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1be/0x4c0 lib/kobject.c:721 put_device+0x1b/0x30 drivers/base/core.c:3624 ar5523_probe+0xe38/0x1d10 drivers/net/wireless/ath/ar5523/ar5523.c:1719 usb_probe_interface+0x30b/0x7f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:560 [inline] really_probe+0x249/0xb90 drivers/base/dd.c:639 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808 __device_attach_driver+0x1d0/0x2e0 drivers/base/dd.c:936 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x1e4/0x530 drivers/base/dd.c:1008 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xbd5/0x1e90 drivers/base/core.c:3517 usb_set_configuration+0x1019/0x1900 drivers/usb/core/message.c:2170 Memory state around the buggy address: ffff88811a82f300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811a82f380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88811a82f400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811a82f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811a82f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 75 72 jne 0x78 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 48 8b 5b 18 mov 0x18(%rbx),%rbx 14: 48 8d 7b 70 lea 0x70(%rbx),%rdi 18: 48 89 fa mov %rdi,%rdx 1b: 48 c1 ea 03 shr $0x3,%rdx 1f: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 23: 75 5a jne 0x7f 25: 48 8b 53 70 mov 0x70(%rbx),%rdx * 29: b8 01 00 00 00 mov $0x1,%eax <-- trapping instruction 2e: 48 85 d5 test %rdx,%rbp 31: 74 0c je 0x3f 33: 65 ff 0d a4 96 d1 7e decl %gs:0x7ed196a4(%rip) # 0x7ed196de 3a: 74 21 je 0x5d 3c: 5b pop %rbx 3d: 5d pop %rbp 3e: c3 retq