================================================================== 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 ffff88809625d060 by task modprobe/13499 CPU: 1 PID: 13499 Comm: modprobe Not tainted 5.9.0-rc3-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+0x1f7/0xa91 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:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:syscall_enter_from_user_mode+0x35/0x290 kernel/entry/common.c:80 Code: 53 48 8b 7c 24 20 e8 ba f9 ff ff e8 95 a8 84 f9 e8 70 a6 84 f9 48 83 3d 50 a7 c0 01 00 0f 84 93 00 00 00 fb 66 0f 1f 44 00 00 <65> 48 8b 2c 25 c0 fe 01 00 48 8b 5d 00 f7 c3 c1 01 00 10 75 0a 5b RSP: 0018:ffffc9000832ff20 EFLAGS: 00000282 RAX: 00000000000001e9 RBX: 0000000000000000 RCX: 1ffffffff1565169 RDX: ffff88805b8f6040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000832ff58 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000015 R13: ffffc9000832ff58 R14: 0000000000000000 R15: 0000000000000000 do_syscall_64+0xf/0x70 arch/x86/entry/common.c:41 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f6f5f125217 Code: c8 ff c3 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d 19 bf 20 00 f7 d8 89 01 48 83 c8 ff c3 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d f9 be 20 00 f7 d8 89 01 48 83 RSP: 002b:00007fffbd031f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6f5f125217 RDX: 00007f6f5f10c190 RSI: 0000000000000004 RDI: 00007f6f5f12bc70 RBP: 00007fffbd0321a0 R08: 0000000000000050 R09: 00007f6f5f331c20 R10: 00007f6f5f12931a R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000010 R14: 0000000000000000 R15: 00007f6f5f331170 Allocated by task 13488: 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:755 [inline] kvzalloc include/linux/mm.h:763 [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 13488: 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 ffff88809625d000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 96 bytes inside of 1024-byte region [ffff88809625d000, ffff88809625d400) The buggy address belongs to the page: page:00000000f2af171b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9625d flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002576208 ffffea0002875208 ffff8880aa040700 raw: 0000000000000000 ffff88809625d000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809625cf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88809625cf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88809625d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809625d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809625d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================