==================================================================
BUG: KASAN: slab-use-after-free in find_endpoint+0x2a3/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1618
Read of size 1 at addr ffff8880133c2a62 by task syz.0.1456/12309
CPU: 2 UID: 0 PID: 12309 Comm: syz.0.1456 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
find_endpoint+0x2a3/0x2c0 drivers/usb/gadget/udc/dummy_hcd.c:1618
dummy_timer+0x500/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:1890
__run_hrtimer kernel/time/hrtimer.c:2067 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2124
hrtimer_run_softirq+0x1ca/0x360 kernel/time/hrtimer.c:2141
handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x194/0x210 kernel/softirq.c:767
irq_exit_rcu+0x9/0x30 kernel/softirq.c:784
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:finish_task_switch.isra.0+0x2ca/0x10d0 kernel/sched/core.c:5361
Code: b6 0a 00 00 41 c7 87 20 0e 00 00 00 00 00 00 e9 47 04 00 00 49 8d 7f 48 e8 13 8b e9 09 e8 ee be 3c 00 fb 48 8d bb 08 17 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0000:ffffc9000def78c0 EFLAGS: 00000202
RAX: 0000000000000a73 RBX: ffff888022caa580 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8e3abbd4 RDI: ffff888022cabc88
RBP: ffffc9000def7918 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888024f3a580
R13: 0000000000000001 R14: ffffffff91427a64 R15: ffff88802b43b7c0
context_switch kernel/sched/core.c:5513 [inline]
__schedule+0x1264/0x6740 kernel/sched/core.c:7239
__schedule_loop kernel/sched/core.c:7316 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7331
futex_do_wait+0x88/0x180 kernel/futex/waitwake.c:387
__futex_wait+0x1c4/0x300 kernel/futex/waitwake.c:722
futex_wait+0xe6/0x370 kernel/futex/waitwake.c:750
do_futex+0x265/0x440 kernel/futex/syscalls.c:133
__do_sys_futex_time32 kernel/futex/syscalls.c:524 [inline]
__se_sys_futex_time32 kernel/futex/syscalls.c:507 [inline]
__ia32_sys_futex_time32+0x2f4/0x470 kernel/futex/syscalls.c:507
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
__do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fa4fec
Code: Unable to access opcode bytes at 0xf7fa4fc2.
RSP: 002b:00000000ffbc95ac EFLAGS: 00000202 ORIG_RAX: 00000000000000f0
RAX: ffffffffffffffda RBX: 00000000f7464f8c RCX: 0000000000000080
RDX: 0000000000000000 RSI: 00000000ffbc9748 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 37:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5334 [inline]
__kmalloc_noprof+0x324/0x820 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
ieee802_11_parse_elems_full+0x17c/0x3bc0 net/mac80211/parse.c:1073
ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2551 [inline]
ieee80211_inform_bss+0x159/0x1170 net/mac80211/scan.c:79
rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
cfg80211_inform_single_bss_data+0x898/0x1dc0 net/wireless/scan.c:2382
cfg80211_inform_bss_data+0x230/0x3b60 net/wireless/scan.c:3241
cfg80211_inform_bss_frame_data+0x245/0x7c0 net/wireless/scan.c:3333
ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
ieee80211_rx_bss_info net/mac80211/ibss.c:1063 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1544 [inline]
ieee80211_ibss_rx_queued_mgmt+0xe04/0x1c70 net/mac80211/ibss.c:1571
ieee80211_iface_process_skb net/mac80211/iface.c:1769 [inline]
ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1823
cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:538
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 37:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2677 [inline]
slab_free mm/slub.c:6377 [inline]
kfree+0x22b/0x6c0 mm/slub.c:6692
ieee80211_inform_bss+0x8f5/0x1170 net/mac80211/scan.c:164
rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
cfg80211_inform_single_bss_data+0x898/0x1dc0 net/wireless/scan.c:2382
cfg80211_inform_bss_data+0x230/0x3b60 net/wireless/scan.c:3241
cfg80211_inform_bss_frame_data+0x245/0x7c0 net/wireless/scan.c:3333
ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
ieee80211_rx_bss_info net/mac80211/ibss.c:1063 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1544 [inline]
ieee80211_ibss_rx_queued_mgmt+0xe04/0x1c70 net/mac80211/ibss.c:1571
ieee80211_iface_process_skb net/mac80211/iface.c:1769 [inline]
ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1823
cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:538
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff8880133c2800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 610 bytes inside of
freed 1024-byte region [ffff8880133c2800, ffff8880133c2c00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880133c1800 pfn:0x133c0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801c042dc0 ffffea000075ae10 ffffea0000982210
raw: ffff8880133c1800 0000000800100009 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801c042dc0 ffffea000075ae10 ffffea0000982210
head: ffff8880133c1800 0000000800100009 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 28, tgid 28 (ksoftirqd/1), ts 65133404303, free_ts 56760776232
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0xf46/0x3500 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3266 [inline]
allocate_slab mm/slub.c:3380 [inline]
new_slab+0xa2/0x660 mm/slub.c:3426
refill_objects+0xe3/0x410 mm/slub.c:7310
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x372/0x680 mm/slub.c:4675
alloc_from_pcs mm/slub.c:4773 [inline]
slab_alloc_node mm/slub.c:4905 [inline]
__do_kmalloc_node mm/slub.c:5333 [inline]
__kmalloc_noprof+0x66b/0x820 mm/slub.c:5359
_kmalloc_noprof include/linux/slab.h:992 [inline]
_kzalloc_noprof include/linux/slab.h:1309 [inline]
ieee802_11_parse_elems_full+0x17c/0x3bc0 net/mac80211/parse.c:1073
ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2551 [inline]
ieee80211_inform_bss+0x159/0x1170 net/mac80211/scan.c:79
rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
cfg80211_inform_single_bss_data+0x898/0x1dc0 net/wireless/scan.c:2382
cfg80211_inform_bss_data+0x230/0x3b60 net/wireless/scan.c:3241
cfg80211_inform_bss_frame_data+0x245/0x7c0 net/wireless/scan.c:3333
ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
ieee80211_scan_rx+0x4e6/0xb60 net/mac80211/scan.c:364
__ieee80211_rx_handle_packet+0xbab/0xfc0 net/mac80211/rx.c:5427
ieee80211_rx_list+0xf19/0x2160 net/mac80211/rx.c:5720
page last free pid 5743 tgid 5743 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4584 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
kmem_cache_alloc_lru_noprof+0x267/0x6a0 mm/slub.c:4950
__d_alloc+0x35/0xa50 fs/dcache.c:1907
d_alloc_anon fs/dcache.c:2004 [inline]
d_alloc_cursor+0x3e/0xe0 fs/dcache.c:2010
dcache_dir_open+0x3b/0x90 fs/libfs.c:87
do_dentry_open+0x6ab/0x14d0 fs/open.c:996
vfs_open+0x82/0x3f0 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x19fa/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_compat_sys_openat fs/open.c:1485 [inline]
__se_compat_sys_openat fs/open.c:1483 [inline]
__ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1483
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
__do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
Memory state around the buggy address:
ffff8880133c2900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880133c2980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880133c2a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880133c2a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880133c2b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: b6 0a mov $0xa,%dh
2: 00 00 add %al,(%rax)
4: 41 c7 87 20 0e 00 00 movl $0x0,0xe20(%r15)
b: 00 00 00 00
f: e9 47 04 00 00 jmp 0x45b
14: 49 8d 7f 48 lea 0x48(%r15),%rdi
18: e8 13 8b e9 09 call 0x9e98b30
1d: e8 ee be 3c 00 call 0x3cbf10
22: fb sti
23: 48 8d bb 08 17 00 00 lea 0x1708(%rbx),%rdi
* 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
31: fc ff df
34: 48 89 fa mov %rdi,%rdx
37: 48 c1 ea 03 shr $0x3,%rdx
3b: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax
3f: 84 .byte 0x84