------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 7669 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 7669 Comm: syz-executor Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 lr : refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 sp : ffff8000080178c0 x29: ffff8000080178c0 x28: ffff0000f2bc9800 x27: ffff0000c7423808 x26: ffff0000ede405f0 x25: dfff800000000000 x24: 1fffe00018e84701 x23: ffff0000f1153400 x22: ffff0000d5f29d94 x21: ffff0000f4263880 x20: ffff0000d5f29d94 x19: ffff800017a32000 x18: ffff800011a7bce0 x17: ffff8000181a1000 x16: ffff8000082d1c00 x15: 0000000000000000 x14: 0000000000000012 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100 x11: ff0080000819149c x10: 0000000000000000 x9 : 0ee02b0264b5ec00 x8 : 0ee02b0264b5ec00 x7 : ffff800008306a88 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 0000000000000101 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_net include/net/net_namespace.h:257 [inline] tipc_aead_encrypt net/tipc/crypto.c:821 [inline] tipc_crypto_xmit+0x1518/0x2014 net/tipc/crypto.c:1761 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:477 [inline] __irq_exit_rcu+0x23c/0x43c kernel/softirq.c:679 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] console_emit_next_record+0x7d0/0x954 kernel/printk/printk.c:2783 console_flush_all kernel/printk/printk.c:-1 [inline] console_unlock+0x240/0x57c kernel/printk/printk.c:2906 vprintk_emit+0x14c/0x2dc kernel/printk/printk.c:2303 vprintk_default+0x54/0x80 kernel/printk/printk.c:2318 vprintk+0x1e8/0x284 kernel/printk/printk_safe.c:45 _printk+0xd0/0x118 kernel/printk/printk.c:2328 batadv_hardif_enable_interface+0x668/0x820 net/batman-adv/hard-interface.c:750 batadv_softif_slave_add+0x80/0x134 net/batman-adv/soft-interface.c:842 do_set_master net/core/rtnetlink.c:2630 [inline] do_setlink+0xb78/0x32c4 net/core/rtnetlink.c:2840 __rtnl_newlink net/core/rtnetlink.c:3608 [inline] rtnl_newlink+0x12d0/0x1a1c net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6153 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6171 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x304/0x3fc net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2161 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 46101 hardirqs last enabled at (46100): [] console_trylock_spinning+0x1b0/0x2e0 kernel/printk/printk.c:1930 hardirqs last disabled at (46101): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (45992): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (45992): [] clusterip_netdev_event+0x384/0x3ac net/ipv4/netfilter/ipt_CLUSTERIP.c:233 softirqs last disabled at (46019): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 7669 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 7669 Comm: syz-executor Tainted: G W 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 lr : refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 sp : ffff8000080178c0 x29: ffff8000080178c0 x28: ffff0000f2bc9800 x27: 0000000000000000 x26: ffff0000ede405f0 x25: dfff800000000000 x24: 1fffe0001dbc80c8 x23: 1fffe0001aa3a379 x22: ffff0000c7423800 x21: 00000000c0000000 x20: ffff0000d5f29d94 x19: ffff800017a32000 x18: ffff800011a7bce0 x17: ffff800011a69e14 x16: ffff8000082d1c00 x15: 0000000000000000 x14: 0000000000000012 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100 x11: ff0080000819149c x10: 0000000000000000 x9 : 0ee02b0264b5ec00 x8 : 0ee02b0264b5ec00 x7 : ffff800008306a88 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 0000000000000101 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] put_net include/net/net_namespace.h:276 [inline] tipc_aead_encrypt net/tipc/crypto.c:829 [inline] tipc_crypto_xmit+0x1664/0x2014 net/tipc/crypto.c:1761 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:477 [inline] __irq_exit_rcu+0x23c/0x43c kernel/softirq.c:679 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] console_emit_next_record+0x7d0/0x954 kernel/printk/printk.c:2783 console_flush_all kernel/printk/printk.c:-1 [inline] console_unlock+0x240/0x57c kernel/printk/printk.c:2906 vprintk_emit+0x14c/0x2dc kernel/printk/printk.c:2303 vprintk_default+0x54/0x80 kernel/printk/printk.c:2318 vprintk+0x1e8/0x284 kernel/printk/printk_safe.c:45 _printk+0xd0/0x118 kernel/printk/printk.c:2328 batadv_hardif_enable_interface+0x668/0x820 net/batman-adv/hard-interface.c:750 batadv_softif_slave_add+0x80/0x134 net/batman-adv/soft-interface.c:842 do_set_master net/core/rtnetlink.c:2630 [inline] do_setlink+0xb78/0x32c4 net/core/rtnetlink.c:2840 __rtnl_newlink net/core/rtnetlink.c:3608 [inline] rtnl_newlink+0x12d0/0x1a1c net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6153 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6171 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x304/0x3fc net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2161 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 46121 hardirqs last enabled at (46120): [] console_trylock_spinning+0x1b0/0x2e0 kernel/printk/printk.c:1930 hardirqs last disabled at (46121): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (45992): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (45992): [] clusterip_netdev_event+0x384/0x3ac net/ipv4/netfilter/ipt_CLUSTERIP.c:233 softirqs last disabled at (46019): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]---