================================================================== BUG: KASAN: use-after-free in ether_addr_equal include/linux/etherdevice.h:329 [inline] BUG: KASAN: use-after-free in ipvlan_xmit_mode_l2 drivers/net/ipvlan/ipvlan_core.c:599 [inline] BUG: KASAN: use-after-free in ipvlan_queue_xmit+0x161a/0x18a0 drivers/net/ipvlan/ipvlan_core.c:645 Read of size 4 at addr ffff8880201543ff by task syz-executor410/8671 CPU: 0 PID: 8671 Comm: syz-executor410 Not tainted 5.13.0-rc1-next-20210512-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x13e/0x1d6 lib/dump_stack.c:129 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 ether_addr_equal include/linux/etherdevice.h:329 [inline] ipvlan_xmit_mode_l2 drivers/net/ipvlan/ipvlan_core.c:599 [inline] ipvlan_queue_xmit+0x161a/0x18a0 drivers/net/ipvlan/ipvlan_core.c:645 ipvlan_start_xmit+0x45/0x190 drivers/net/ipvlan/ipvlan_main.c:222 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] __dev_direct_xmit+0x527/0x730 net/core/dev.c:4313 dev_direct_xmit include/linux/netdevice.h:2958 [inline] packet_direct_xmit+0x1a5/0x280 net/packet/af_packet.c:244 packet_snd net/packet/af_packet.c:3009 [inline] packet_sendmsg+0x2417/0x5280 net/packet/af_packet.c:3034 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x443b49 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe05690fc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443b49 RDX: 000000000000000e RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffff09 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe05690ff0 R13: 00000000000f4240 R14: 00000000004b8018 R15: 00000000004004b8 Allocated by task 4866: 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:428 [inline] ____kasan_kmalloc mm/kasan/common.c:507 [inline] ____kasan_kmalloc mm/kasan/common.c:466 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:808 [inline] seq_buf_alloc fs/seq_file.c:35 [inline] seq_read_iter+0x79f/0x1220 fs/seq_file.c:207 kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read+0x41e/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 4866: 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:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1581 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1606 slab_free mm/slub.c:3166 [inline] kfree+0xeb/0x650 mm/slub.c:4224 kvfree+0x42/0x50 mm/util.c:616 seq_release+0x4f/0x80 fs/seq_file.c:352 kernfs_fop_release+0xee/0x190 fs/kernfs/file.c:761 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x272/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888020154000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1023 bytes inside of 4096-byte region [ffff888020154000, ffff888020155000) The buggy address belongs to the page: page:ffffea0000805400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20150 head:ffffea0000805400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011042140 raw: 0000000000000000 0000000000040004 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 4866, ts 72933117851, free_ts 72873475504 prep_new_page mm/page_alloc.c:2358 [inline] get_page_from_freelist+0x1033/0x2b60 mm/page_alloc.c:3994 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5200 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1644 [inline] allocate_slab+0x2c5/0x4c0 mm/slub.c:1784 new_slab mm/slub.c:1847 [inline] new_slab_objects mm/slub.c:2593 [inline] ___slab_alloc+0x4bd/0x820 mm/slub.c:2756 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2796 slab_alloc_node mm/slub.c:2878 [inline] slab_alloc mm/slub.c:2920 [inline] __kmalloc+0x315/0x330 mm/slub.c:4062 kmalloc include/linux/slab.h:561 [inline] tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:313 [inline] tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:308 security_file_open+0x52/0x4f0 security/security.c:1633 do_dentry_open+0x358/0x11c0 fs/open.c:813 do_open fs/namei.c:3361 [inline] path_openat+0x1c09/0x27d0 fs/namei.c:3494 do_filp_open+0x190/0x3d0 fs/namei.c:3521 do_sys_openat2+0x16d/0x420 fs/open.c:1196 do_sys_open fs/open.c:1212 [inline] __do_sys_open fs/open.c:1220 [inline] __se_sys_open fs/open.c:1216 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1216 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1298 [inline] __free_pages_ok+0x4ba/0xd20 mm/page_alloc.c:1572 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2374 put_cpu_partial+0x13d/0x230 mm/slub.c:2410 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:438 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:511 [inline] slab_alloc_node mm/slub.c:2912 [inline] slab_alloc mm/slub.c:2920 [inline] kmem_cache_alloc+0x285/0x4a0 mm/slub.c:2925 prepare_kernel_cred+0x23/0x800 kernel/cred.c:687 call_usermodehelper_exec_async+0x10e/0x580 kernel/umh.c:91 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Memory state around the buggy address: ffff888020154280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020154300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888020154380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888020154400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020154480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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