================================================================== BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668 Read of size 8 at addr ffff0000f4d89700 by task ksoftirqd/1/21 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 dev_map_generic_redirect+0xa8/0x59c kernel/bpf/devmap.c:668 xdp_do_generic_redirect_map net/core/filter.c:4416 [inline] xdp_do_generic_redirect+0x3ec/0x6e4 net/core/filter.c:4475 do_xdp_generic+0x460/0x634 net/core/dev.c:4988 __netif_receive_skb_core+0x15d4/0x378c net/core/dev.c:5390 __netif_receive_skb_one_core net/core/dev.c:5567 [inline] __netif_receive_skb+0x114/0x400 net/core/dev.c:5683 process_backlog+0x410/0x784 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+0x5cc/0xd3c net/core/dev.c:6759 handle_softirqs+0x318/0xd58 kernel/softirq.c:578 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:945 smpboot_thread_fn+0x4b0/0x96c kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 6435: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xe0/0x1d0 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] bpf_map_kmalloc_node+0x21c/0x610 kernel/bpf/syscall.c:452 __dev_map_alloc_node+0x70/0x448 kernel/bpf/devmap.c:851 __dev_map_update_elem kernel/bpf/devmap.c:916 [inline] dev_map_update_elem+0x1a8/0x388 kernel/bpf/devmap.c:935 bpf_map_update_value+0x5e8/0x844 kernel/bpf/syscall.c:226 map_update_elem+0x538/0x6b8 kernel/bpf/syscall.c:1463 __sys_bpf+0x2dc/0x654 kernel/bpf/syscall.c:5005 __do_sys_bpf kernel/bpf/syscall.c:5121 [inline] __se_sys_bpf kernel/bpf/syscall.c:5119 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5119 __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+0x58/0x168 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 39: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 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 mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 dev_map_free+0x4a4/0x5f0 kernel/bpf/devmap.c:238 bpf_map_free_deferred+0xbc/0xd0 kernel/bpf/syscall.c:635 process_one_work+0x804/0x1484 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 The buggy address belongs to the object at ffff0000f4d89700 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000f4d89700, ffff0000f4d89780) The buggy address belongs to the physical page: page:000000007178914d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x134d89 memcg:ffff0000f4d8a001 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0002d80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000f4d8a001 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f4d89600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f4d89680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f4d89700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f4d89780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f4d89800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================