vcan0: j1939_tp_rxtimer: 0x000000005aa94f8c: abort rx timeout. Force session deactivation
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BUG: KASAN: use-after-free in __run_hrtimer kernel/time/hrtimer.c:1521 [inline]
BUG: KASAN: use-after-free in __hrtimer_run_queues+0xe18/0xf10 kernel/time/hrtimer.c:1583
Read of size 1 at addr ffff8880904bed73 by task syz-fuzzer/7028

CPU: 0 PID: 7028 Comm: syz-fuzzer Not tainted 5.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 __run_hrtimer kernel/time/hrtimer.c:1521 [inline]
 __hrtimer_run_queues+0xe18/0xf10 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x16d/0x250 kernel/time/hrtimer.c:1600
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x192/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0033:0x4f540b
Code: 08 90 48 8b 50 08 48 8b 49 18 48 89 14 24 ff d1 48 8b 54 24 08 48 c1 fa 20 8b 4c 24 14 39 ca 7f d8 89 d0 8b 4c 24 30 99 f7 f9 <89> 54 24 38 48 8b 6c 24 18 48 83 c4 20 c3 89 54 24 10 48 8b 44 24
RSP: 002b:000000c00017a9d8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 000000000001227e RBX: b9e1372fa7582923 RCX: 0000000000006002
RDX: 0000000000004168 RSI: 000000000000021e RDI: 000000c00d72e180
RBP: 000000c00017a9f0 R08: 000000000087de20 R09: 0000000000000001
R10: 000000c010bea000 R11: 000000000000060d R12: 0000000000000018
R13: 0000000000000000 R14: 0000000000ac98dd R15: 0000000000000000

Allocated by task 16151:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488
 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 j1939_session_new+0x7c/0x3f0 net/can/j1939/transport.c:1418
 j1939_tp_send+0x22f/0x800 net/can/j1939/transport.c:1877
 j1939_sk_send_loop net/can/j1939/socket.c:1037 [inline]
 j1939_sk_sendmsg+0xabf/0x1360 net/can/j1939/socket.c:1160
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362
 ___sys_sendmsg+0x100/0x170 net/socket.c:2416
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 7028:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:476
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x109/0x2b0 mm/slab.c:3757
 j1939_session_destroy net/can/j1939/transport.c:276 [inline]
 __j1939_session_release net/can/j1939/transport.c:284 [inline]
 kref_put include/linux/kref.h:65 [inline]
 j1939_session_put+0x25c/0x330 net/can/j1939/transport.c:289
 j1939_tp_rxtimer+0x2e9/0x2f4 net/can/j1939/transport.c:1194
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x3a2/0xf10 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x16d/0x250 kernel/time/hrtimer.c:1600
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880904bec00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 371 bytes inside of
 512-byte region [ffff8880904bec00, ffff8880904bee00)
The buggy address belongs to the page:
page:ffffea0002412f80 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00027e0908 ffffea000259f6c8 ffff8880aa000a80
raw: 0000000000000000 ffff8880904be000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880904bec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880904bec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880904bed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff8880904bed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880904bee00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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