================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_sub_return include/linux/atomic/atomic-instrumented.h:125 [inline] BUG: KASAN: use-after-free in skb_release_data+0x108/0x790 net/core/skbuff.c:664 Write of size 4 at addr ffff88807b243820 by task kworker/u4:1/17530 CPU: 1 PID: 17530 Comm: kworker/u4:1 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_sub_return include/linux/atomic/atomic-instrumented.h:125 [inline] skb_release_data+0x108/0x790 net/core/skbuff.c:664 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb net/core/skbuff.c:755 [inline] consume_skb net/core/skbuff.c:911 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:905 batadv_forw_packet_free+0x1e7/0x270 net/batman-adv/send.c:471 batadv_iv_send_outstanding_bat_ogm_packet+0x2b5/0x8e0 net/batman-adv/bat_iv_ogm.c:1719 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 6238: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] syslog_print+0xc7/0x580 kernel/printk/printk.c:1487 do_syslog.part.0+0x202/0x640 kernel/printk/printk.c:1655 do_syslog+0x49/0x60 kernel/printk/printk.c:1640 kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x119/0x300 fs/proc/inode.c:321 vfs_read+0x1b5/0x600 fs/read_write.c:483 ksys_read+0x12d/0x250 fs/read_write.c:623 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+0x44/0xae Freed by task 17530: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kfree+0xe4/0x530 mm/slub.c:4543 skb_free_head net/core/skbuff.c:654 [inline] skb_release_data+0x65a/0x790 net/core/skbuff.c:676 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb net/core/skbuff.c:755 [inline] kfree_skb net/core/skbuff.c:773 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:767 __netif_receive_skb_core+0x54f/0x3640 net/core/dev.c:5410 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5434 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5550 process_backlog+0x2a5/0x6c0 net/core/dev.c:6427 __napi_poll+0xaf/0x440 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7136 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3552 put_css_set_locked+0xa93/0x1000 kernel/cgroup/cgroup.c:988 cgroup_migrate_finish+0x380/0x650 kernel/cgroup/cgroup.c:2589 cgroup_attach_task+0x466/0x7a0 kernel/cgroup/cgroup.c:2781 cgroup_attach_task_all+0xb6/0x140 kernel/cgroup/cgroup-v1.c:73 vhost_attach_cgroups_work+0x3a/0x90 drivers/vhost/vhost.c:531 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807b243800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 32 bytes inside of 1024-byte region [ffff88807b243800, ffff88807b243c00) The buggy address belongs to the page: page:ffffea0001ec9000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b240 head:ffffea0001ec9000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c41dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2962, ts 16524547956, free_ts 13109057523 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4151 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5373 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2291 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab mm/slub.c:1900 [inline] new_slab+0x319/0x490 mm/slub.c:1963 ___slab_alloc+0x921/0xfe0 mm/slub.c:2994 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081 slab_alloc_node mm/slub.c:3172 [inline] slab_alloc mm/slub.c:3214 [inline] __kmalloc+0x305/0x320 mm/slub.c:4387 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_init_log+0x126a/0x1ec0 security/tomoyo/audit.c:275 tomoyo_supervisor+0x34d/0xf00 security/tomoyo/common.c:2097 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x17f/0x1f0 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1438/0x1f80 security/tomoyo/domain.c:879 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline] tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:91 security_bprm_check+0x45/0xa0 security/security.c:866 search_binary_handler fs/exec.c:1713 [inline] exec_binprm fs/exec.c:1766 [inline] bprm_execve fs/exec.c:1835 [inline] bprm_execve+0x732/0x19b0 fs/exec.c:1797 do_execveat_common+0x5e3/0x780 fs/exec.c:1924 do_execve fs/exec.c:1992 [inline] __do_sys_execve fs/exec.c:2068 [inline] __se_sys_execve fs/exec.c:2063 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:2063 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 free_contig_range+0xa8/0xf0 mm/page_alloc.c:9252 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1016 debug_vm_pgtable+0x295b/0x29ed mm/debug_vm_pgtable.c:1329 do_one_initcall+0x103/0x650 init/main.c:1289 do_initcall_level init/main.c:1362 [inline] do_initcalls init/main.c:1378 [inline] do_basic_setup init/main.c:1397 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1599 kernel_init+0x1a/0x1d0 init/main.c:1491 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88807b243700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b243780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807b243800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b243880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b243900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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