================================================================== BUG: KASAN: use-after-free in macvlan_dev_get_iflink+0x5f/0x70 drivers/net/macvlan.c:1138 Read of size 4 at addr ffff88807ad700d8 by task syz-executor.4/4246 CPU: 1 PID: 4246 Comm: syz-executor.4 Tainted: G W 5.17.0-syzkaller-02237-g1bc191051dca #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+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3e0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 macvlan_dev_get_iflink+0x5f/0x70 drivers/net/macvlan.c:1138 dev_get_iflink+0x73/0xe0 net/core/dev.c:618 default_operstate net/core/link_watch.c:41 [inline] rfc2863_policy+0x233/0x2d0 net/core/link_watch.c:53 linkwatch_do_dev+0x2a/0x150 net/core/link_watch.c:160 linkwatch_forget_dev+0x17d/0x210 net/core/link_watch.c:249 netdev_wait_allrefs net/core/dev.c:9832 [inline] netdev_run_todo+0x40b/0xaa0 net/core/dev.c:9950 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x420/0xb80 net/core/rtnetlink.c:5597 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 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 RIP: 0033:0x7f4b15c89049 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:00007f4b16d86168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4b15d9bf60 RCX: 00007f4b15c89049 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006 RBP: 00007f4b15ce308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4b162cfb1f R14: 00007f4b16d86300 R15: 0000000000022000 Allocated by task 4246: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:607 [inline] kvmalloc_node+0x3e/0x130 mm/util.c:580 kvmalloc include/linux/slab.h:734 [inline] kvzalloc include/linux/slab.h:742 [inline] alloc_netdev_mqs+0x98/0x1070 net/core/dev.c:10163 rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3204 __rtnl_newlink+0xf82/0x1760 net/core/rtnetlink.c:3473 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5596 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 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 4252: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:215 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3523 [inline] kfree+0xd6/0x4d0 mm/slub.c:4576 kvfree+0x42/0x50 mm/util.c:615 device_release+0x9f/0x240 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 netdev_run_todo+0x778/0xaa0 net/core/dev.c:9973 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x420/0xb80 net/core/rtnetlink.c:5597 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 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 The buggy address belongs to the object at ffff88807ad70000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 216 bytes inside of 4096-byte region [ffff88807ad70000, ffff88807ad71000) The buggy address belongs to the page: page:ffffea0001eb5c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ad70 head:ffffea0001eb5c00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888073ae74c1 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c4c280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888073ae74c1 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 2965, ts 147105383477, free_ts 147085816601 prep_new_page mm/page_alloc.c:2382 [inline] get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4123 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5349 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2262 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8d0/0xf30 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] __kmalloc_node+0x2cb/0x390 mm/slub.c:4482 kmalloc_node include/linux/slab.h:607 [inline] kvmalloc_node+0x3e/0x130 mm/util.c:580 kvmalloc include/linux/slab.h:734 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x7f7/0x1280 fs/seq_file.c:210 kernfs_fop_read_iter+0x514/0x6f0 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2075 [inline] new_sync_read+0x429/0x6e0 fs/read_write.c:401 vfs_read+0x35c/0x600 fs/read_write.c:482 ksys_read+0x12d/0x250 fs/read_write.c:620 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] free_pcp_prepare+0x548/0xd10 mm/page_alloc.c:1400 free_unref_page_prepare mm/page_alloc.c:3269 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3364 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:239 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] __kmem_cache_alloc_lru mm/slub.c:3245 [inline] kmem_cache_alloc_lru+0x255/0x720 mm/slub.c:3262 alloc_inode_sb include/linux/fs.h:3016 [inline] alloc_inode+0x168/0x230 fs/inode.c:262 iget_locked+0x1cc/0x740 fs/inode.c:1283 kernfs_get_inode+0x47/0x520 fs/kernfs/inode.c:254 kernfs_iop_lookup+0x1e5/0x320 fs/kernfs/dir.c:1137 __lookup_slow+0x24c/0x480 fs/namei.c:1707 lookup_slow fs/namei.c:1724 [inline] walk_component+0x40f/0x6a0 fs/namei.c:2020 link_path_walk.part.0+0x7ef/0xf70 fs/namei.c:2347 link_path_walk fs/namei.c:2272 [inline] path_openat+0x266/0x2940 fs/namei.c:3605 do_filp_open+0x1aa/0x400 fs/namei.c:3636 Memory state around the buggy address: ffff88807ad6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ad70000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ad70080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ad70100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ad70180: fb fb fb fb fb fb fb fb fb fb fb fb 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