vcan0: j1939_xtp_rx_dat_one: 0xffff888015f3cc00: last 00
vcan0: j1939_xtp_rx_dat_one: 0xffff8880279a8800: last 15
vcan0: j1939_xtp_rx_dat_one: 0xffff888015f3cc00: last 15
vcan0: j1939_xtp_rx_dat_one: 0xffff888015f3cc00: Data of RX-looped back packet (00 ff ff ff ff ff ff) doesn't match TX data (00 00 00 00 00 00 00)!
==================================================================
BUG: KASAN: slab-use-after-free in j1939_xtp_rx_dat_one+0xe58/0xea0 net/can/j1939/transport.c:1888
Read of size 1 at addr ffff88806d305a4e by task ksoftirqd/0/15

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.3.0-syzkaller-12378-gc8c655c34e33 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 j1939_xtp_rx_dat_one+0xe58/0xea0 net/can/j1939/transport.c:1888
 j1939_xtp_rx_dat net/can/j1939/transport.c:1940 [inline]
 j1939_tp_recv+0x7d5/0xf50 net/can/j1939/transport.c:2134
 j1939_can_recv net/can/j1939/main.c:112 [inline]
 j1939_can_recv+0x78e/0xa80 net/can/j1939/main.c:38
 deliver net/can/af_can.c:572 [inline]
 can_rcv_filter+0x5d4/0x8d0 net/can/af_can.c:606
 can_receive+0x31d/0x5c0 net/can/af_can.c:663
 can_rcv+0x1e1/0x280 net/can/af_can.c:687
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
 process_backlog+0x101/0x670 net/core/dev.c:5933
 __napi_poll+0xb7/0x6f0 net/core/dev.c:6496
 napi_poll net/core/dev.c:6563 [inline]
 net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:939 [inline]
 run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
 smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 5501:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:711 [inline]
 slab_alloc_node mm/slub.c:3451 [inline]
 kmem_cache_alloc_node+0x185/0x3e0 mm/slub.c:3496
 __alloc_skb+0x288/0x330 net/core/skbuff.c:644
 alloc_skb include/linux/skbuff.h:1288 [inline]
 alloc_skb_with_frags+0x9a/0x6c0 net/core/skbuff.c:6370
 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2729
 sock_alloc_send_skb include/net/sock.h:1860 [inline]
 j1939_sk_alloc_skb net/can/j1939/socket.c:864 [inline]
 j1939_sk_send_loop net/can/j1939/socket.c:1121 [inline]
 j1939_sk_sendmsg+0x6ba/0x13a0 net/can/j1939/socket.c:1256
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 sock_no_sendpage+0x10c/0x160 net/core/sock.c:3230
 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3582
 kernel_sendpage net/socket.c:3579 [inline]
 sock_sendpage+0xe7/0x180 net/socket.c:1082
 pipe_to_sendpage+0x2b1/0x380 fs/splice.c:455
 splice_from_pipe_feed fs/splice.c:509 [inline]
 __splice_from_pipe+0x449/0x8a0 fs/splice.c:653
 splice_from_pipe fs/splice.c:688 [inline]
 generic_splice_sendpage+0xd8/0x140 fs/splice.c:836
 do_splice_from fs/splice.c:857 [inline]
 direct_splice_actor+0x114/0x180 fs/splice.c:1023
 splice_direct_to_actor+0x335/0x8a0 fs/splice.c:978
 do_splice_direct+0x1ab/0x280 fs/splice.c:1066
 do_sendfile+0xb19/0x12c0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 21:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3786 [inline]
 kmem_cache_free+0xe9/0x480 mm/slub.c:3808
 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:971
 __kfree_skb net/core/skbuff.c:1029 [inline]
 kfree_skb_reason+0x186/0x3c0 net/core/skbuff.c:1064
 kfree_skb include/linux/skbuff.h:1236 [inline]
 j1939_session_skb_drop_old net/can/j1939/transport.c:347 [inline]
 j1939_xtp_rx_cts_one net/can/j1939/transport.c:1445 [inline]
 j1939_xtp_rx_cts+0x614/0xfa0 net/can/j1939/transport.c:1484
 j1939_tp_cmd_recv net/can/j1939/transport.c:2072 [inline]
 j1939_tp_recv+0x565/0xf50 net/can/j1939/transport.c:2144
 j1939_can_recv net/can/j1939/main.c:112 [inline]
 j1939_can_recv+0x78e/0xa80 net/can/j1939/main.c:38
 deliver net/can/af_can.c:572 [inline]
 can_rcv_filter+0x5d4/0x8d0 net/can/af_can.c:606
 can_receive+0x31d/0x5c0 net/can/af_can.c:663
 can_rcv+0x1e1/0x280 net/can/af_can.c:687
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
 process_backlog+0x101/0x670 net/core/dev.c:5933
 __napi_poll+0xb7/0x6f0 net/core/dev.c:6496
 napi_poll net/core/dev.c:6563 [inline]
 net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571

The buggy address belongs to the object at ffff88806d305a00
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 78 bytes inside of
 freed 240-byte region [ffff88806d305a00, ffff88806d305af0)

The buggy address belongs to the physical page:
page:ffffea0001b4c140 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6d305
anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000200 ffff88814325a000 0000000000000000 0000000000000001
raw: 0000000000000000 00000000000c000c 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 15, tgid 15 (ksoftirqd/0), ts 158744509559, free_ts 157654543811
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1722
 prep_new_page mm/page_alloc.c:1729 [inline]
 get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3493
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2277
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x390 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3192
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291
 __slab_alloc_node mm/slub.c:3344 [inline]
 slab_alloc_node mm/slub.c:3441 [inline]
 slab_alloc mm/slub.c:3459 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3466 [inline]
 kmem_cache_alloc+0x38e/0x3b0 mm/slub.c:3475
 skb_clone+0x172/0x3c0 net/core/skbuff.c:1864
 can_send+0x69b/0xb30 net/can/af_can.c:260
 j1939_send_one+0x29f/0x360 net/can/j1939/main.c:355
 j1939_tp_tx_dat net/can/j1939/transport.c:646 [inline]
 j1939_session_tx_dat net/can/j1939/transport.c:838 [inline]
 j1939_xtp_txnext_transmiter net/can/j1939/transport.c:900 [inline]
 j1939_tp_txtimer+0xac9/0x29b0 net/can/j1939/transport.c:1160
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x5fa/0xbe0 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17f/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x1d4/0x905 kernel/softirq.c:571
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1302 [inline]
 free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2555
 free_unref_page+0x33/0x370 mm/page_alloc.c:2650
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2636
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:711 [inline]
 slab_alloc_node mm/slub.c:3451 [inline]
 __kmem_cache_alloc_node+0x17c/0x320 mm/slub.c:3490
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:986
 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:585
 __alloc_skb+0x129/0x330 net/core/skbuff.c:654
 alloc_skb include/linux/skbuff.h:1288 [inline]
 alloc_skb_with_frags+0x9a/0x6c0 net/core/skbuff.c:6370
 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2729
 sock_alloc_send_skb include/net/sock.h:1860 [inline]
 j1939_sk_alloc_skb net/can/j1939/socket.c:864 [inline]
 j1939_sk_send_loop net/can/j1939/socket.c:1121 [inline]
 j1939_sk_sendmsg+0x6ba/0x13a0 net/can/j1939/socket.c:1256
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 sock_no_sendpage+0x10c/0x160 net/core/sock.c:3230
 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3582

Memory state around the buggy address:
 ffff88806d305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806d305980: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff88806d305a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88806d305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff88806d305b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================