vcan0: j1939_xtp_rx_dat: no rx connection found
vcan0: j1939_xtp_rx_dat_one: 0xffff8880398f1800: last 00
vcan0: j1939_xtp_rx_dat_one: 0xffff8880398f1800: 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: use-after-free in j1939_xtp_rx_dat_one+0xbf7/0xd20 net/can/j1939/transport.c:1849
Read of size 1 at addr ffff888028f2068e by task ksoftirqd/1/19

CPU: 1 PID: 19 Comm: ksoftirqd/1 Tainted: G        W         5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:96
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 j1939_xtp_rx_dat_one+0xbf7/0xd20 net/can/j1939/transport.c:1849
 j1939_xtp_rx_dat net/can/j1939/transport.c:1901 [inline]
 j1939_tp_recv+0x3fe/0x8e0 net/can/j1939/transport.c:2083
 j1939_can_recv+0x584/0x7a0 net/can/j1939/main.c:101
 deliver net/can/af_can.c:574 [inline]
 can_rcv_filter+0x4ce/0x7b0 net/can/af_can.c:608
 can_receive+0x2b7/0x490 net/can/af_can.c:665
 can_rcv+0xce/0x150 net/can/af_can.c:696
 __netif_receive_skb_one_core+0x104/0x180 net/core/dev.c:5486
 process_backlog+0x1d2/0x610 net/core/dev.c:6464
 __napi_poll+0x94/0x350 net/core/dev.c:7019
 napi_poll net/core/dev.c:7086 [inline]
 net_rx_action+0x6fc/0xa50 net/core/dev.c:7173
 __do_softirq+0x29b/0x9bd kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x548/0x8c0 kernel/smpboot.c:164
 kthread+0x38b/0x460 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 5990:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2970 [inline]
 kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:3006
 __alloc_skb+0x153/0x280 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1112 [inline]
 alloc_skb_with_frags+0x73/0x540 net/core/skbuff.c:6004
 sock_alloc_send_pskb+0x636/0x7c0 net/core/sock.c:2400
 j1939_sk_alloc_skb net/can/j1939/socket.c:861 [inline]
 j1939_sk_send_loop net/can/j1939/socket.c:1043 [inline]
 j1939_sk_sendmsg+0x5ac/0x10f0 net/can/j1939/socket.c:1178
 sock_sendmsg_nosec net/socket.c:702 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:722
 sock_no_sendpage+0xe7/0x120 net/core/sock.c:2898
 kernel_sendpage.part.0+0x11e/0x240 net/socket.c:3666
 kernel_sendpage net/socket.c:3663 [inline]
 sock_sendpage+0xc7/0x1a0 net/socket.c:995
 pipe_to_sendpage+0x245/0x410 fs/splice.c:364
 splice_from_pipe_feed fs/splice.c:418 [inline]
 __splice_from_pipe+0x362/0x810 fs/splice.c:562
 splice_from_pipe fs/splice.c:597 [inline]
 generic_splice_sendpage+0xba/0x120 fs/splice.c:746
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xfb/0x1c0 fs/splice.c:936
 splice_direct_to_actor+0x2dd/0x7c0 fs/splice.c:891
 do_splice_direct+0x154/0x260 fs/splice.c:979
 do_sendfile+0x824/0x1020 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0x186/0x1d0 fs/read_write.c:1311
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 13:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:229 [inline]
 slab_free_hook mm/slub.c:1639 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1664
 slab_free mm/slub.c:3224 [inline]
 kmem_cache_free+0x8e/0x5a0 mm/slub.c:3240
 j1939_session_skb_drop_old net/can/j1939/transport.c:336 [inline]
 j1939_xtp_rx_cts_one net/can/j1939/transport.c:1418 [inline]
 j1939_xtp_rx_cts+0x9fa/0x1150 net/can/j1939/transport.c:1457
 j1939_tp_cmd_recv net/can/j1939/transport.c:2027 [inline]
 j1939_tp_recv+0x662/0x8e0 net/can/j1939/transport.c:2093
 j1939_can_recv+0x584/0x7a0 net/can/j1939/main.c:101
 deliver net/can/af_can.c:574 [inline]
 can_rcv_filter+0x4ce/0x7b0 net/can/af_can.c:608
 can_receive+0x2b7/0x490 net/can/af_can.c:665
 can_rcv+0xce/0x150 net/can/af_can.c:696
 __netif_receive_skb_one_core+0x104/0x180 net/core/dev.c:5486
 process_backlog+0x1d2/0x610 net/core/dev.c:6464
 __napi_poll+0x94/0x350 net/core/dev.c:7019
 napi_poll net/core/dev.c:7086 [inline]
 net_rx_action+0x6fc/0xa50 net/core/dev.c:7173
 __do_softirq+0x29b/0x9bd kernel/softirq.c:558

The buggy address belongs to the object at ffff888028f20640
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 78 bytes inside of
 224-byte region [ffff888028f20640, ffff888028f20720)
The buggy address belongs to the page:
page:ffffea0000a3c800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28f20
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff8881445f7000
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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 19, ts 103597212743, free_ts 102770182827
 prep_new_page mm/page_alloc.c:2445 [inline]
 get_page_from_freelist+0xa6f/0x2f50 mm/page_alloc.c:4178
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386
 alloc_slab_page mm/slub.c:1702 [inline]
 allocate_slab+0x32b/0x4c0 mm/slub.c:1842
 new_slab mm/slub.c:1905 [inline]
 new_slab_objects mm/slub.c:2651 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2814
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2854
 slab_alloc_node mm/slub.c:2936 [inline]
 kmem_cache_alloc_node+0x12c/0x3e0 mm/slub.c:3006
 __alloc_skb+0x153/0x280 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1112 [inline]
 j1939_tp_tx_dat_new+0x2b/0x4b0 net/can/j1939/transport.c:583
 j1939_xtp_do_tx_ctl+0x69/0x170 net/can/j1939/transport.c:644
 j1939_tp_tx_ctl net/can/j1939/transport.c:662 [inline]
 j1939_session_tx_eoma net/can/j1939/transport.c:968 [inline]
 j1939_xtp_txnext_receiver net/can/j1939/transport.c:1008 [inline]
 j1939_tp_txtimer+0x1634/0x1fa0 net/can/j1939/transport.c:1142
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601
 hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618
 __do_softirq+0x29b/0x9bd kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x548/0x8c0 kernel/smpboot.c:164
 kthread+0x38b/0x460 kernel/kthread.c:319
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1355 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3341 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3420
 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2432
 put_cpu_partial+0x13d/0x230 mm/slub.c:2468
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2970 [inline]
 kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:3006
 __alloc_skb+0x153/0x280 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1112 [inline]
 alloc_skb_with_frags+0x73/0x540 net/core/skbuff.c:6004
 sock_alloc_send_pskb+0x636/0x7c0 net/core/sock.c:2400
 j1939_sk_alloc_skb net/can/j1939/socket.c:861 [inline]
 j1939_sk_send_loop net/can/j1939/socket.c:1043 [inline]
 j1939_sk_sendmsg+0x5ac/0x10f0 net/can/j1939/socket.c:1178
 sock_sendmsg_nosec net/socket.c:702 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:722
 sock_no_sendpage+0xe7/0x120 net/core/sock.c:2898
 kernel_sendpage.part.0+0x11e/0x240 net/socket.c:3666
 kernel_sendpage net/socket.c:3663 [inline]
 sock_sendpage+0xc7/0x1a0 net/socket.c:995

Memory state around the buggy address:
 ffff888028f20580: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff888028f20600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888028f20680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888028f20700: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888028f20780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================