================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline] BUG: KASAN: use-after-free in refcount_sub_and_test include/linux/refcount.h:266 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:294 [inline] BUG: KASAN: use-after-free in xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262 Write of size 4 at addr ffff888056ee0060 by task syz-executor.1/6902 CPU: 0 PID: 6902 Comm: syz-executor.1 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_write include/linux/instrumented.h:71 [inline] atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline] refcount_sub_and_test include/linux/refcount.h:266 [inline] refcount_dec_and_test include/linux/refcount.h:294 [inline] xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262 xsk_destruct+0x7d/0xa0 net/xdp/xsk.c:1138 __sk_destruct+0x4b/0x860 net/core/sock.c:1764 rcu_do_batch kernel/rcu/tree.c:2428 [inline] rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2656 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:rcu_rnp_online_cpus kernel/rcu/tree.c:216 [inline] RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1161 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0xc1/0x120 kernel/rcu/tree.c:1150 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 75 61 48 8d 7d 70 48 8b 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 49 48 8b 45 70 48 85 c3 0f 95 c0 65 ff 0d cc f8 9e 7e 74 03 5b RSP: 0018:ffffc900053afcd8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff815c0f8f RDX: 1ffffffff140e10e RSI: 0000000000000002 RDI: ffffffff8a070870 RBP: ffffffff8a070800 R08: 0000000000000000 R09: ffffffff8b5c12cf R10: fffffbfff16b8259 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88808ec84ee8 R14: ffffffff81a6d19f R15: 0000000000000000 rcu_read_lock_held_common kernel/rcu/update.c:123 [inline] rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_sched_held+0x25/0xb0 kernel/rcu/update.c:134 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x6a1/0x8f0 kernel/locking/lockdep.c:5040 __might_fault mm/memory.c:4870 [inline] __might_fault+0x190/0x1d0 mm/memory.c:4855 _copy_from_user+0x29/0x190 lib/usercopy.c:12 copy_from_user include/linux/uaccess.h:160 [inline] get_timespec64+0x75/0x220 kernel/time/time.c:787 __do_sys_nanosleep kernel/time/hrtimer.c:1962 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1957 [inline] __x64_sys_nanosleep+0xaa/0x260 kernel/time/hrtimer.c:1957 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c641 Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 64 cd fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffc0aed6ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000015000f RCX: 000000000045c641 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffc0aed6cb0 RBP: 0000000000000ede R08: 0000000000000000 R09: 000000000340b940 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffc0aed6d00 R14: 000000000014feef R15: 00007ffc0aed6d10 Allocated by task 25772: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmalloc_node include/linux/slab.h:577 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:757 [inline] kvzalloc include/linux/mm.h:765 [inline] xp_create_and_assign_umem+0x58/0x8d0 net/xdp/xsk_buff_pool.c:54 xsk_bind+0x9a0/0xed0 net/xdp/xsk.c:709 __sys_bind+0x1e9/0x250 net/socket.c:1656 __do_sys_bind net/socket.c:1667 [inline] __se_sys_bind net/socket.c:1665 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 25772: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kfree+0x10e/0x2b0 mm/slab.c:3756 kvfree+0x42/0x50 mm/util.c:603 xp_destroy net/xdp/xsk_buff_pool.c:44 [inline] xp_destroy+0x45/0x60 net/xdp/xsk_buff_pool.c:38 xsk_bind+0xbdd/0xed0 net/xdp/xsk.c:719 __sys_bind+0x1e9/0x250 net/socket.c:1656 __do_sys_bind net/socket.c:1667 [inline] __se_sys_bind net/socket.c:1665 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888056ee0000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 96 bytes inside of 4096-byte region [ffff888056ee0000, ffff888056ee1000) The buggy address belongs to the page: page:00000000b0e016ed refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56ee0 head:00000000b0e016ed order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00023dd208 ffffea0002558008 ffff8880aa040900 raw: 0000000000000000 ffff888056ee0000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888056edff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056edff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888056ee0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888056ee0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056ee0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================