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BUG: KASAN: use-after-free in dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:668
Read of size 8 at addr ffff88810d223400 by task kworker/u4:0/8

CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 6.1.128-syzkaller-00029-g5145d157731f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: tipc_send tipc_conn_send_work
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
 dev_map_generic_redirect+0x9f/0x7d0 kernel/bpf/devmap.c:668
 xdp_do_generic_redirect_map net/core/filter.c:4415 [inline]
 xdp_do_generic_redirect+0x42e/0xb40 net/core/filter.c:4474
 do_xdp_generic+0x53e/0x800 net/core/dev.c:4968
 __netif_receive_skb_core+0x19ae/0x43d0 net/core/dev.c:5375
 __netif_receive_skb_one_core net/core/dev.c:5552 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5668
 process_backlog+0x32c/0x630 net/core/dev.c:5996
 __napi_poll+0xbe/0x5c0 net/core/dev.c:6563
 napi_poll net/core/dev.c:6630 [inline]
 net_rx_action+0x595/0xdd0 net/core/dev.c:6744
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq+0xb/0xd kernel/softirq.c:662
 do_softirq+0xf6/0x150 kernel/softirq.c:506
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:430
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x50/0x60 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 tipc_conn_send_to_sock net/tipc/topsrv.c:264 [inline]
 tipc_conn_send_work+0x211/0x990 net/tipc/topsrv.c:305
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 2920:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node+0xb4/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454
 __dev_map_alloc_node+0x5c/0x4e0 kernel/bpf/devmap.c:851
 __dev_map_update_elem kernel/bpf/devmap.c:916 [inline]
 dev_map_update_elem+0x20e/0x3f0 kernel/bpf/devmap.c:935
 bpf_map_update_value+0x23a/0x410 kernel/bpf/syscall.c:228
 map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443
 __sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4995
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 43:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1745 [inline]
 slab_free_freelist_hook mm/slub.c:1771 [inline]
 slab_free mm/slub.c:3686 [inline]
 __kmem_cache_free+0x21d/0x410 mm/slub.c:3702
 kfree+0x7a/0xf0 mm/slab_common.c:990
 dev_map_free+0x593/0x6c0 kernel/bpf/devmap.c:238
 bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 kvfree_call_rcu+0x9f/0x800 kernel/rcu/tree.c:3445
 kernfs_unlink_open_file+0x327/0x3d0 fs/kernfs/file.c:635
 kernfs_fop_release+0x253/0x310 fs/kernfs/file.c:807
 __fput+0x1e5/0x870 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x24d/0x2e0 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88810d223400
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff88810d223400, ffff88810d223460)

The buggy address belongs to the physical page:
page:ffffea00043488c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810d223c00 pfn:0x10d223
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004db6508 ffffea0004ccfb08 ffff888100042900
raw: ffff88810d223c00 0000000000200015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 1455, tgid 1454 (syz.0.494), ts 37723493819, free_ts 35640118009
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5837
 alloc_slab_page+0x6c/0xf0
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x207/0x2a0 mm/slub.c:3462
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa3/0x1e0 mm/slab_common.c:951
 kmalloc_array include/linux/slab.h:615 [inline]
 kcalloc include/linux/slab.h:646 [inline]
 ext4_find_extent+0x375/0xe30 fs/ext4/extents.c:914
 ext4_ext_map_blocks+0x257/0x7340 fs/ext4/extents.c:4165
 ext4_map_blocks+0xa25/0x1ca0 fs/ext4/inode.c:678
 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:821
 ext4_get_block_unwritten+0x2e/0x110 fs/ext4/inode.c:854
 ext4_block_write_begin+0x55e/0x1200 fs/ext4/inode.c:1123
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1545 [inline]
 free_pcp_prepare mm/page_alloc.c:1619 [inline]
 free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3581
 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3677
 free_the_page mm/page_alloc.c:830 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5926
 pcpu_free_pages mm/percpu-vm.c:65 [inline]
 pcpu_depopulate_chunk+0x4df/0x5b0 mm/percpu-vm.c:330
 pcpu_reclaim_populated mm/percpu.c:2193 [inline]
 pcpu_balance_workfn+0x2bb/0xe60 mm/percpu.c:2245
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff88810d223300: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff88810d223380: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88810d223400: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff88810d223480: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff88810d223500: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
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