==================================================================
BUG: KASAN: use-after-free in dev_map_generic_redirect+0xa0/0x650 kernel/bpf/devmap.c:668
Read of size 8 at addr ffff888050fe2d00 by task ksoftirqd/1/21
CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.133-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:427
kasan_report+0x136/0x160 mm/kasan/report.c:531
dev_map_generic_redirect+0xa0/0x650 kernel/bpf/devmap.c:668
xdp_do_generic_redirect_map net/core/filter.c:4416 [inline]
xdp_do_generic_redirect+0x4c4/0x850 net/core/filter.c:4475
do_xdp_generic+0x50b/0x6d0 net/core/dev.c:4988
__netif_receive_skb_core+0x1c88/0x41d0 net/core/dev.c:5390
__netif_receive_skb_one_core net/core/dev.c:5567 [inline]
__netif_receive_skb+0x11c/0x530 net/core/dev.c:5683
process_backlog+0x381/0x760 net/core/dev.c:6011
__napi_poll+0xc7/0x470 net/core/dev.c:6578
napi_poll net/core/dev.c:6645 [inline]
net_rx_action+0x70f/0xeb0 net/core/dev.c:6759
handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578
run_ksoftirqd+0xc6/0x120 kernel/softirq.c:945
smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Allocated by task 8702:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node+0xb3/0x230 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
bpf_map_kmalloc_node+0xce/0x1c0 kernel/bpf/syscall.c:452
__dev_map_alloc_node+0x56/0x4d0 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+0x5cf/0x6f0 kernel/bpf/syscall.c:226
map_update_elem+0x503/0x680 kernel/bpf/syscall.c:1463
__sys_bpf+0x337/0x6c0 kernel/bpf/syscall.c:5005
__do_sys_bpf kernel/bpf/syscall.c:5121 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5119 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5119
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 6580:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
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+0x25c/0x3c0 mm/slub.c:3674
dev_map_free+0x571/0x690 kernel/bpf/devmap.c:238
process_one_work+0x917/0x1260 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff888050fe2d00
which belongs to the cache kmalloc-cg-96 of size 96
The buggy address is located 0 bytes inside of
96-byte region [ffff888050fe2d00, ffff888050fe2d60)
The buggy address belongs to the physical page:
page:ffffea000143f880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x50fe2
memcg:ffff88807cb34201
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888017c428c0
raw: 0000000000000000 0000000000200020 00000001ffffffff ffff88807cb34201
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 8639, tgid 8639 (syz.0.1426), ts 224915355469, free_ts 224770500167
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5606
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xc20/0x1270 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
get_undo_list ipc/sem.c:1856 [inline]
copy_semundo+0xb1/0x230 ipc/sem.c:2314
copy_process+0x186e/0x40a0 kernel/fork.c:2251
kernel_clone+0x222/0x920 kernel/fork.c:2681
__do_sys_clone3 kernel/fork.c:2980 [inline]
__se_sys_clone3+0x3eb/0x440 kernel/fork.c:2964
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
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384
free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479
tlb_batch_list_free mm/mmu_gather.c:75 [inline]
tlb_finish_mmu+0x119/0x1f0 mm/mmu_gather.c:364
exit_mmap+0x3b3/0x980 mm/mmap.c:3250
__mmput+0x115/0x3c0 kernel/fork.c:1200
exit_mm+0x226/0x300 kernel/exit.c:565
do_exit+0x9f1/0x26a0 kernel/exit.c:858
do_group_exit+0x202/0x2b0 kernel/exit.c:1021
get_signal+0x16cb/0x17a0 kernel/signal.c:2871
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff888050fe2c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888050fe2c80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888050fe2d00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888050fe2d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888050fe2e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================