------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 6148 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 1 PID: 6148 Comm: syz.8.396 Not tainted 5.15.185-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 : ffff800008017640 x29: ffff800008017640 x28: ffff0000c8ff2800 x27: ffff0000cf294400 x26: 1fffe0001cd07a39 x25: dfff800000000000 x24: 1fffe00019e52881 x23: ffff0000e9381c00 x22: ffff0000d02c8154 x21: ffff0000d0af4880 x20: ffff0000d02c8154 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000100 x10: 0000000000000000 x9 : 27a369d2a3638c00 x8 : 27a369d2a3638c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800008016f38 x4 : ffff80001423f280 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000000000100 x0 : 000000000000002a 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:252 [inline] tipc_aead_encrypt net/tipc/crypto.c:832 [inline] tipc_crypto_xmit+0x1634/0x2220 net/tipc/crypto.c:1772 tipc_crypto_clone_msg+0x98/0x150 net/tipc/crypto.c:1667 tipc_crypto_xmit+0x17a0/0x2220 net/tipc/crypto.c:1728 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline] __local_bh_enable_ip+0x200/0x380 kernel/softirq.c:406 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0xec/0x174 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:408 [inline] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 htable_put+0x1bc/0x214 net/netfilter/xt_hashlimit.c:430 hashlimit_mt_destroy_v1+0x5c/0x6c net/netfilter/xt_hashlimit.c:970 cleanup_match net/ipv4/netfilter/ip_tables.c:460 [inline] find_check_entry net/ipv4/netfilter/ip_tables.c:564 [inline] translate_table+0x12cc/0x17fc net/ipv4/netfilter/ip_tables.c:717 do_replace net/ipv4/netfilter/ip_tables.c:1138 [inline] do_ipt_set_ctl+0xa10/0xe00 net/ipv4/netfilter/ip_tables.c:1636 nf_setsockopt+0x270/0x290 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x1d0c/0x2978 net/ipv4/ip_sockglue.c:1442 udp_setsockopt+0xa4/0xbc net/ipv4/udp.c:2818 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x2f8/0x4b0 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 129813 hardirqs last enabled at (129812): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (129813): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (129544): [] spin_unlock_bh include/linux/spinlock.h:408 [inline] softirqs last enabled at (129544): [] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 softirqs last disabled at (129547): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (129547): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (129547): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (129547): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 84619bb97ed236b9 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 6148 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 6148 Comm: syz.8.396 Tainted: G W 5.15.185-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 : ffff800008017640 x29: ffff800008017640 x28: ffff0000c8ff2800 x27: 0000000000000000 x26: 1fffe0001cd07a39 x25: dfff800000000000 x24: 1fffe00019e52881 x23: ffff0000cd396e10 x22: ffff0000d02c8000 x21: ffff0000d0af4880 x20: ffff0000d02c8154 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000100 x10: 0000000000000000 x9 : 27a369d2a3638c00 x8 : 27a369d2a3638c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800008016f38 x4 : ffff80001423f280 x3 : ffff80000a732684 x2 : ffff0001a110ad10 x1 : 0000000000000100 x0 : 0000000000000026 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:270 [inline] tipc_aead_encrypt net/tipc/crypto.c:840 [inline] tipc_crypto_xmit+0x177c/0x2220 net/tipc/crypto.c:1772 tipc_crypto_clone_msg+0x98/0x150 net/tipc/crypto.c:1667 tipc_crypto_xmit+0x17a0/0x2220 net/tipc/crypto.c:1728 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline] __local_bh_enable_ip+0x200/0x380 kernel/softirq.c:406 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0xec/0x174 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:408 [inline] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 htable_put+0x1bc/0x214 net/netfilter/xt_hashlimit.c:430 hashlimit_mt_destroy_v1+0x5c/0x6c net/netfilter/xt_hashlimit.c:970 cleanup_match net/ipv4/netfilter/ip_tables.c:460 [inline] find_check_entry net/ipv4/netfilter/ip_tables.c:564 [inline] translate_table+0x12cc/0x17fc net/ipv4/netfilter/ip_tables.c:717 do_replace net/ipv4/netfilter/ip_tables.c:1138 [inline] do_ipt_set_ctl+0xa10/0xe00 net/ipv4/netfilter/ip_tables.c:1636 nf_setsockopt+0x270/0x290 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x1d0c/0x2978 net/ipv4/ip_sockglue.c:1442 udp_setsockopt+0xa4/0xbc net/ipv4/udp.c:2818 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x2f8/0x4b0 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 129839 hardirqs last enabled at (129838): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (129839): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (129544): [] spin_unlock_bh include/linux/spinlock.h:408 [inline] softirqs last enabled at (129544): [] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 softirqs last disabled at (129547): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (129547): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (129547): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (129547): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 84619bb97ed236ba ]--- ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 6148 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 Modules linked in: CPU: 1 PID: 6148 Comm: syz.8.396 Tainted: G W 5.15.185-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+0x1b4/0x1f8 lib/refcount.c:22 lr : refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 sp : ffff800008017800 x29: ffff800008017800 x28: ffff0000c8ff3800 x27: ffff0000cf294a00 x26: 1fffe0001cd07a39 x25: dfff800000000000 x24: 1fffe00019e52941 x23: ffff0000e9381c00 x22: ffff0000d02c8154 x21: 000000007ffffffe x20: ffff0000d02c8154 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000100 x10: 0000000000000000 x9 : 27a369d2a3638c00 x8 : 27a369d2a3638c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000080170f8 x4 : ffff80001423f280 x3 : ffff800008300a0c x2 : 0000000000000001 x1 : 0000000000000100 x0 : 0000000000000026 Call trace: refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 __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:252 [inline] tipc_aead_encrypt net/tipc/crypto.c:832 [inline] tipc_crypto_xmit+0x1634/0x2220 net/tipc/crypto.c:1772 tipc_bearer_xmit_skb+0x1f0/0x384 net/tipc/bearer.c:574 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x19c/0x858 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x46c/0x6c4 kernel/time/timer.c:1767 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:457 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 irq_exit+0x14/0x88 kernel/softirq.c:683 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x6c/0x88 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline] __local_bh_enable_ip+0x200/0x380 kernel/softirq.c:406 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0xec/0x174 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:408 [inline] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 htable_put+0x1bc/0x214 net/netfilter/xt_hashlimit.c:430 hashlimit_mt_destroy_v1+0x5c/0x6c net/netfilter/xt_hashlimit.c:970 cleanup_match net/ipv4/netfilter/ip_tables.c:460 [inline] find_check_entry net/ipv4/netfilter/ip_tables.c:564 [inline] translate_table+0x12cc/0x17fc net/ipv4/netfilter/ip_tables.c:717 do_replace net/ipv4/netfilter/ip_tables.c:1138 [inline] do_ipt_set_ctl+0xa10/0xe00 net/ipv4/netfilter/ip_tables.c:1636 nf_setsockopt+0x270/0x290 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x1d0c/0x2978 net/ipv4/ip_sockglue.c:1442 udp_setsockopt+0xa4/0xbc net/ipv4/udp.c:2818 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3446 __sys_setsockopt+0x2f8/0x4b0 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2211 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 129899 hardirqs last enabled at (129898): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (129899): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (129544): [] spin_unlock_bh include/linux/spinlock.h:408 [inline] softirqs last enabled at (129544): [] htable_selective_cleanup+0x234/0x2d0 net/netfilter/xt_hashlimit.c:374 softirqs last disabled at (129547): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (129547): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (129547): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (129547): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 84619bb97ed236bb ]---