------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 7771 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 7771 Comm: syz.1.958 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 : ffff800008007640 x29: ffff800008007640 x28: ffff0000e66d3000 x27: ffff0000d4083200 x26: 1fffe0001b254369 x25: dfff800000000000 x24: 1fffe0001a810641 x23: ffff0000d54e5000 x22: ffff0000d9249bd4 x21: ffff0000d7f1c080 x20: ffff0000d9249bd4 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 0000000000000012 x14: 0000000000ff0100 x13: 1ffff0000282c06b x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 1aa2c276ab8efd00 x8 : 1aa2c276ab8efd00 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000100000101 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_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_acquire+0x234/0x620 kernel/locking/lockdep.c:5626 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 put_rng+0x2c/0x13c drivers/char/hw_random/core.c:145 rng_dev_read+0x274/0x5f8 drivers/char/hw_random/core.c:259 do_loop_readv_writev fs/read_write.c:-1 [inline] do_iter_read+0x448/0x698 fs/read_write.c:792 vfs_readv fs/read_write.c:910 [inline] do_preadv+0x1c0/0x2f0 fs/read_write.c:1002 __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __arm64_sys_preadv+0xa0/0xb8 fs/read_write.c:1047 __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: 56051 hardirqs last enabled at (56050): [] console_trylock_spinning+0x160/0x268 kernel/printk/printk.c:1891 hardirqs last disabled at (56051): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (55746): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (55746): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (56015): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (56015): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (56015): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (56015): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 65fe4f699634ab5b ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 7771 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 0 PID: 7771 Comm: syz.1.958 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 : ffff800008007640 x29: ffff800008007640 x28: ffff0000e66d3000 x27: 0000000000000000 x26: 1fffe0001b254369 x25: dfff800000000000 x24: 1fffe0001a810641 x23: ffff0000c1d22910 x22: ffff0000d9249a80 x21: ffff0000d7f1c080 x20: ffff0000d9249bd4 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 0000000000000012 x14: 0000000000ff0100 x13: 1ffff0000282c06b x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 1aa2c276ab8efd00 x8 : 1aa2c276ab8efd00 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000100000101 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_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_acquire+0x234/0x620 kernel/locking/lockdep.c:5626 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 put_rng+0x2c/0x13c drivers/char/hw_random/core.c:145 rng_dev_read+0x274/0x5f8 drivers/char/hw_random/core.c:259 do_loop_readv_writev fs/read_write.c:-1 [inline] do_iter_read+0x448/0x698 fs/read_write.c:792 vfs_readv fs/read_write.c:910 [inline] do_preadv+0x1c0/0x2f0 fs/read_write.c:1002 __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __arm64_sys_preadv+0xa0/0xb8 fs/read_write.c:1047 __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: 56071 hardirqs last enabled at (56070): [] console_trylock_spinning+0x160/0x268 kernel/printk/printk.c:1891 hardirqs last disabled at (56071): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (55746): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (55746): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (56015): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (56015): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (56015): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (56015): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 65fe4f699634ab5c ]--- ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 0 PID: 7771 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 Modules linked in: CPU: 0 PID: 7771 Comm: syz.1.958 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 : ffff800008007800 x29: ffff800008007800 x28: ffff0000e66d2400 x27: ffff0000d4022600 x26: 1fffe0001b254369 x25: dfff800000000000 x24: 1fffe0001a8044c1 x23: ffff0000d54e5000 x22: ffff0000d9249bd4 x21: 000000007ffffffe x20: ffff0000d9249bd4 x19: ffff80001659e000 x18: 0000000000000101 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 0000000000000012 x14: 0000000000ff0100 x13: 1ffff0000282c06b x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 1aa2c276ab8efd00 x8 : 1aa2c276ab8efd00 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008503958 x2 : 0000000000000001 x1 : 0000000100000101 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_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_acquire+0x234/0x620 kernel/locking/lockdep.c:5626 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 put_rng+0x2c/0x13c drivers/char/hw_random/core.c:145 rng_dev_read+0x274/0x5f8 drivers/char/hw_random/core.c:259 do_loop_readv_writev fs/read_write.c:-1 [inline] do_iter_read+0x448/0x698 fs/read_write.c:792 vfs_readv fs/read_write.c:910 [inline] do_preadv+0x1c0/0x2f0 fs/read_write.c:1002 __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __arm64_sys_preadv+0xa0/0xb8 fs/read_write.c:1047 __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: 56111 hardirqs last enabled at (56110): [] console_trylock_spinning+0x160/0x268 kernel/printk/printk.c:1891 hardirqs last disabled at (56111): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (55746): [] softirq_handle_end kernel/softirq.c:419 [inline] softirqs last enabled at (55746): [] handle_softirqs+0xa4c/0xbf0 kernel/softirq.c:604 softirqs last disabled at (56015): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (56015): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (56015): [] invoke_softirq kernel/softirq.c:457 [inline] softirqs last disabled at (56015): [] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:659 ---[ end trace 65fe4f699634ab5d ]---