================================================================== BUG: KASAN: use-after-free in macvlan_dev_get_iflink+0x6a/0x70 drivers/net/macvlan.c:1138 Read of size 4 at addr ffff88807b40e0d8 by task syz-executor.1/8738 CPU: 1 PID: 8738 Comm: syz-executor.1 Not tainted 5.17.0-rc2-syzkaller-00316-g0457e5153e0e #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+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x3a0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 macvlan_dev_get_iflink+0x6a/0x70 drivers/net/macvlan.c:1138 default_operstate net/core/link_watch.c:41 [inline] rfc2863_policy+0x11f/0x2a0 net/core/link_watch.c:53 linkwatch_do_dev+0x38/0x160 net/core/link_watch.c:160 netdev_wait_allrefs net/core/dev.c:9832 [inline] netdev_run_todo+0x585/0xd00 net/core/dev.c:9950 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x976/0xec0 net/core/rtnetlink.c:5595 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x81a/0x9f0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xaec/0xe60 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmsg+0x280/0x370 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5ce20b7059 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5ce0a0b168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5ce21ca030 RCX: 00007f5ce20b7059 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 00007f5ce211108d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffef2f6f37f R14: 00007f5ce0a0b300 R15: 0000000000022000 Allocated by task 8729: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc_node+0x28e/0x420 mm/slub.c:4472 kmalloc_node include/linux/slab.h:604 [inline] kvmalloc_node+0x6e/0xe0 mm/util.c:580 kvmalloc include/linux/slab.h:732 [inline] kvzalloc include/linux/slab.h:740 [inline] alloc_netdev_mqs+0x85/0xda0 net/core/dev.c:10163 rtnl_create_link+0x2db/0x9e0 net/core/rtnetlink.c:3202 __rtnl_newlink net/core/rtnetlink.c:3471 [inline] rtnl_newlink+0x13dc/0x1d80 net/core/rtnetlink.c:3529 rtnetlink_rcv_msg+0x96f/0xec0 net/core/rtnetlink.c:5594 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x81a/0x9f0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xaec/0xe60 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmsg+0x280/0x370 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 8729: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x180 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xb8/0x2e0 mm/slub.c:4562 device_release+0x98/0x1c0 kobject_cleanup+0x1c0/0x280 lib/kobject.c:705 netdev_run_todo+0xb6f/0xd00 net/core/dev.c:9973 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x976/0xec0 net/core/rtnetlink.c:5595 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x81a/0x9f0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xaec/0xe60 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmsg+0x280/0x370 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88807b40e000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 216 bytes inside of 4096-byte region [ffff88807b40e000, ffff88807b40f000) The buggy address belongs to the page: page:ffffea0001ed0200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b408 head:ffffea0001ed0200 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88801836fd41 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000a78600 dead000000000002 ffff88801144c280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801836fd41 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3645, ts 199382631330, free_ts 199190938496 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4165 __alloc_pages+0x255/0x580 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0xce/0x3f0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x3fe/0xc30 mm/slub.c:3018 __slab_alloc mm/slub.c:3105 [inline] slab_alloc_node mm/slub.c:3196 [inline] __kmalloc_node+0x2ec/0x420 mm/slub.c:4468 kmalloc_node include/linux/slab.h:604 [inline] kvmalloc_node+0x6e/0xe0 mm/util.c:580 kvmalloc include/linux/slab.h:732 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x205/0xdc0 fs/seq_file.c:210 call_read_iter include/linux/fs.h:2068 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0xaf9/0xe60 fs/read_write.c:481 ksys_read+0x18f/0x2c0 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0xd1c/0xe00 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3404 free_slab mm/slub.c:2043 [inline] discard_slab mm/slub.c:2049 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2536 put_cpu_partial+0x116/0x180 mm/slub.c:2612 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x107/0x160 mm/slub.c:3516 qlist_free_all mm/kasan/quarantine.c:176 [inline] kasan_quarantine_reduce+0x169/0x1f0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x1c9/0x310 mm/slub.c:3243 getname_flags+0xba/0x650 fs/namei.c:138 do_sys_openat2+0xd2/0x500 fs/open.c:1208 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88807b40df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b40e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b40e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b40e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b40e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================