================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] BUG: KASAN: slab-use-after-free in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] BUG: KASAN: slab-use-after-free in try_module_get+0x4c/0xd0 kernel/module/main.c:941 Write of size 4 at addr ffff88802fb56308 by task syz.4.2393/14819 CPU: 2 UID: 0 PID: 14819 Comm: syz.4.2393 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/0x1d0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 [inline] kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:112 [inline] atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] try_module_get+0x4c/0xd0 kernel/module/main.c:941 dvb_device_open+0x124/0x3b0 drivers/media/dvb-core/dvbdev.c:103 chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6d8/0x1660 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x208c/0x31a0 fs/namei.c:4858 do_file_open+0x20e/0x430 fs/namei.c:4887 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f577075d60e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007f577166db28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f577166e6c0 RCX: 00007f577075d60e RDX: 0000000000000002 RSI: 00007f577166dc00 RDI: ffffffffffffff9c RBP: 00007f577166dc00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f5770a16038 R14: 00007f5770a15fa0 R15: 00007ffce9f23c18 Allocated by task 14732: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_node_noprof+0x25a/0x6f0 mm/slub.c:4950 __alloc_skb+0x140/0x710 net/core/skbuff.c:702 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] audit_buffer_alloc kernel/audit.c:1841 [inline] audit_log_start+0x350/0x930 kernel/audit.c:1960 audit_seccomp+0x61/0x1f0 kernel/auditsc.c:2948 seccomp_log kernel/seccomp.c:1048 [inline] __seccomp_filter+0x850/0x1140 kernel/seccomp.c:1376 __secure_computing+0x221/0x2e0 kernel/seccomp.c:1404 syscall_trace_enter include/linux/entry-common.h:103 [inline] syscall_enter_from_user_mode_work include/linux/entry-common.h:147 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:178 [inline] do_syscall_64+0x5d8/0xf80 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 40: 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:2689 [inline] slab_free mm/slub.c:6246 [inline] kmem_cache_free+0x127/0x6c0 mm/slub.c:6373 kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1137 __kfree_skb net/core/skbuff.c:1204 [inline] sk_skb_reason_drop+0x10f/0x1b0 net/core/skbuff.c:1241 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] kauditd_hold_skb+0x144/0x210 kernel/audit.c:652 kauditd_send_queue+0x232/0x2e0 kernel/audit.c:807 kauditd_thread+0x645/0xb30 kernel/audit.c:931 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 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 ffff88802fb56280 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 136 bytes inside of freed 240-byte region [ffff88802fb56280, ffff88802fb56370) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2fb56 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880129b2a01 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801bf743c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800190019 00000000f5000000 ffff8880129b2a01 head: 00fff00000000040 ffff88801bf743c0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800190019 00000000f5000000 ffff8880129b2a01 head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5723, tgid 5723 (sshd-session), ts 99695054923, free_ts 99680088556 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab mm/slub.c:3467 [inline] new_slab+0xa6/0x6c0 mm/slub.c:3525 refill_objects+0x277/0x420 mm/slub.c:7251 __kmem_cache_alloc_bulk mm/slub.c:7288 [inline] kmem_cache_alloc_bulk_noprof+0x482/0x970 mm/slub.c:7340 napi_skb_cache_get+0x688/0x8e0 net/core/skbuff.c:292 __alloc_skb+0x563/0x710 net/core/skbuff.c:691 napi_alloc_skb+0x42e/0x820 net/core/skbuff.c:853 e1000_alloc_rx_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4121 [inline] e1000_copybreak drivers/net/ethernet/intel/e1000/e1000_main.c:4337 [inline] e1000_clean_rx_irq+0x672/0x1030 drivers/net/ethernet/intel/e1000/e1000_main.c:4389 e1000_clean+0xa33/0x1f70 drivers/net/ethernet/intel/e1000/e1000_main.c:3804 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7730 napi_poll net/core/dev.c:7793 [inline] net_rx_action+0xa40/0xf20 net/core/dev.c:7950 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xac/0xe0 kernel/softirq.c:510 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450 page last free pid 0 tgid 0 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0x747/0x1040 mm/page_alloc.c:2943 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 Memory state around the buggy address: ffff88802fb56200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88802fb56280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802fb56300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88802fb56380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88802fb56400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================