================================================================== BUG: KASAN: use-after-free in dev_map_generic_redirect+0xac/0x57c kernel/bpf/devmap.c:668 Read of size 8 at addr ffff0000d4cee800 by task kworker/1:3/4297 CPU: 1 PID: 4297 Comm: kworker/1:3 Not tainted 6.1.135-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x220 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:427 kasan_report+0xa8/0x100 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 dev_map_generic_redirect+0xac/0x57c kernel/bpf/devmap.c:668 xdp_do_generic_redirect_map net/core/filter.c:4424 [inline] xdp_do_generic_redirect+0x354/0x63c net/core/filter.c:4483 do_xdp_generic+0x484/0x620 net/core/dev.c:4988 __netif_receive_skb_core+0x1324/0x3120 net/core/dev.c:5390 __netif_receive_skb_one_core net/core/dev.c:5567 [inline] __netif_receive_skb+0x78/0x2ac net/core/dev.c:5683 process_backlog+0x408/0x714 net/core/dev.c:6011 __napi_poll+0xb4/0x3f0 net/core/dev.c:6578 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x50c/0xb10 net/core/dev.c:6759 handle_softirqs+0x318/0xc6c kernel/softirq.c:578 __do_softirq+0x14/0x20 kernel/softirq.c:612 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 do_softirq+0xf8/0x1ac kernel/softirq.c:479 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:403 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline] _raw_read_unlock_bh+0x48/0x58 kernel/locking/spinlock.c:284 wg_socket_send_skb_to_peer+0x154/0x1a4 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x19c/0x6c8 drivers/net/wireguard/send.c:276 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4787: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xec/0x178 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] inotify_handle_inode_event+0x290/0x7bc fs/notify/inotify/inotify_fsnotify.c:96 inotify_ignored_and_remove_idr+0x38/0x80 fs/notify/inotify/inotify_user.c:527 inotify_freeing_mark+0x28/0x38 fs/notify/inotify/inotify_fsnotify.c:140 fsnotify_free_mark fs/notify/mark.c:516 [inline] fsnotify_destroy_mark+0x1c8/0x2ec fs/notify/mark.c:525 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:817 [inline] __se_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:794 [inline] __arm64_sys_inotify_rm_watch+0x160/0x220 fs/notify/inotify/inotify_user.c:794 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 3913: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xc0/0x224 mm/slub.c:3674 kfree+0xd0/0x1ac mm/slab_common.c:988 inotify_free_event+0x20/0x30 fs/notify/inotify/inotify_fsnotify.c:190 fsnotify_destroy_event+0xf8/0x118 fs/notify/notification.c:67 inotify_read+0x3b8/0xac0 fs/notify/inotify/inotify_user.c:275 vfs_read+0x288/0x7c4 fs/read_write.c:468 ksys_read+0x120/0x210 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000d4cee800 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000d4cee800, ffff0000d4cee880) The buggy address belongs to the physical page: page:0000000078e682b7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114cee memcg:ffff0000d0142a01 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0002d80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000d0142a01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d4cee700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d4cee780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d4cee800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d4cee880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d4cee900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================