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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 ffff888115efd900 by task kworker/1:3/315
CPU: 1 PID: 315 Comm: kworker/1:3 Tainted: G W 6.1.129-syzkaller-00054-g3e6e324f5b47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: wg-crypt-wg1 wg_packet_tx_worker
Call Trace:
__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
__local_bh_enable_ip+0x75/0x80 kernel/softirq.c:430
__raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
_raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
wg_socket_send_skb_to_peer+0x178/0x1d0 drivers/net/wireguard/socket.c:184
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x1d7/0x520 drivers/net/wireguard/send.c:276
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
Allocated by task 4828:
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+0xb4/0x1e0 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+0x39/0x50 fs/ext4/inode.c:838
ext4_block_write_begin+0x55e/0x1200 fs/ext4/inode.c:1123
ext4_write_begin+0x5e0/0xfb0 fs/ext4/ext4_jbd2.h:-1
ext4_da_write_begin+0x2ff/0x920 fs/ext4/inode.c:3000
generic_perform_write+0x318/0x780 mm/filemap.c:3880
ext4_buffered_write_iter+0x360/0x640 fs/ext4/file.c:285
ext4_file_write_iter+0x194/0x1570 fs/ext4/file.c:-1
do_iter_readv_writev fs/read_write.c:-1 [inline]
do_iter_write+0x6e6/0xc40 fs/read_write.c:861
vfs_iter_write+0x7c/0xa0 fs/read_write.c:902
ovl_write_iter+0xba6/0x11d0 fs/overlayfs/file.c:368
do_iter_readv_writev fs/read_write.c:-1 [inline]
do_iter_write+0x6e6/0xc40 fs/read_write.c:861
vfs_writev+0x2d4/0x590 fs/read_write.c:934
do_pwritev fs/read_write.c:1031 [inline]
__do_sys_pwritev2 fs/read_write.c:1090 [inline]
__se_sys_pwritev2+0x1c6/0x2c0 fs/read_write.c:1081
__x64_sys_pwritev2+0xe5/0x100 fs/read_write.c:1081
x64_sys_call+0x8b0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:329
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
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
Second to 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 ffff888115efd900
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
96-byte region [ffff888115efd900, ffff888115efd960)
The buggy address belongs to the physical page:
page:ffffea000457bf40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888115efd600 pfn:0x115efd
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004bf1f88 ffffea000459c688 ffff888100042900
raw: ffff888115efd600 000000000020000e 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 112, tgid 112 (udevd), ts 4980073457, free_ts 0
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 include/linux/gfp.h:-1
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
kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
kernfs_get_open_node fs/kernfs/file.c:574 [inline]
kernfs_fop_open+0x70e/0xb10 fs/kernfs/file.c:742
do_dentry_open+0x891/0x1250 fs/open.c:884
vfs_open+0x73/0x80 fs/open.c:1015
do_open fs/namei.c:3625 [inline]
path_openat+0x2532/0x2d60 fs/namei.c:3782
do_filp_open+0x230/0x480 fs/namei.c:3809
do_sys_openat2+0x151/0x870 fs/open.c:1341
page_owner free stack trace missing
Memory state around the buggy address:
ffff888115efd800: 00 00 00 00 00 00 00 00 00 00 01 fc fc fc fc fc
ffff888115efd880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888115efd900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888115efd980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888115efda00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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