------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 4013 at lib/refcount.c:25 refcount_warn_saturate+0x134/0x1f8 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 4013 Comm: syz-executor 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 : ffff80001b7f6500 x29: ffff80001b7f6500 x28: ffff0000e73c9400 x27: ffff0000ce17c400 x26: 1fffe0001b4d96d1 x25: dfff800000000000 x24: 1fffe00019c2f881 x23: ffff0000cf95bc00 x22: ffff0000c1d01bd4 x21: ffff0000daa5e080 x20: ffff0000c1d01bd4 x19: ffff80001659e000 x18: 0000000000000102 x17: 0000000000000000 x16: ffff8000111a97c4 x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 3e4a8f9dc3b6e100 x8 : 3e4a8f9dc3b6e100 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001b7f5df8 x4 : ffff80001423f280 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] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline] ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x314/0x414 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:452 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_write_xmit+0x12e0/0x4d60 net/ipv4/tcp_output.c:2707 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2892 tcp_push+0x410/0x604 net/ipv4/tcp.c:738 tcp_sendmsg_locked+0x25d0/0x2ce8 net/ipv4/tcp.c:1429 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x23c/0x31c net/socket.c:1079 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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: 1647579 hardirqs last enabled at (1647578): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (1647579): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1647508): [] local_bh_enable+0x10/0x1d0 include/linux/bottom_half.h:31 softirqs last disabled at (1647509): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (1647509): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1647509): [] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 ---[ end trace 5acafa2e6ee5e7c1 ]--- ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 4013 at lib/refcount.c:28 refcount_warn_saturate+0x154/0x1f8 lib/refcount.c:28 Modules linked in: CPU: 0 PID: 4013 Comm: syz-executor 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 : ffff80001b7f6500 x29: ffff80001b7f6500 x28: ffff0000e73c9400 x27: 0000000000000000 x26: 1fffe0001b4d96d1 x25: dfff800000000000 x24: 1fffe00019c2f881 x23: ffff0000c895f410 x22: ffff0000c1d01a80 x21: ffff0000daa5e080 x20: ffff0000c1d01bd4 x19: ffff80001659e000 x18: 0000000000000102 x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 3e4a8f9dc3b6e100 x8 : 3e4a8f9dc3b6e100 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001b7f5df8 x4 : ffff80001423f280 x3 : ffff800008300a0c 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] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline] ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x314/0x414 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:452 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_write_xmit+0x12e0/0x4d60 net/ipv4/tcp_output.c:2707 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2892 tcp_push+0x410/0x604 net/ipv4/tcp.c:738 tcp_sendmsg_locked+0x25d0/0x2ce8 net/ipv4/tcp.c:1429 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x23c/0x31c net/socket.c:1079 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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: 1647605 hardirqs last enabled at (1647604): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (1647605): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1647508): [] local_bh_enable+0x10/0x1d0 include/linux/bottom_half.h:31 softirqs last disabled at (1647509): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (1647509): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1647509): [] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 ---[ end trace 5acafa2e6ee5e7c2 ]--- ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 0 PID: 4013 at lib/refcount.c:22 refcount_warn_saturate+0x1b4/0x1f8 lib/refcount.c:22 Modules linked in: CPU: 0 PID: 4013 Comm: syz-executor 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 : ffff80001b7f66c0 x29: ffff80001b7f66c0 x28: ffff0000e73c9000 x27: ffff0000cfedcc00 x26: 1fffe0001b4d96d1 x25: dfff800000000000 x24: 1fffe00019fdb981 x23: ffff0000cf95bc00 x22: ffff0000c1d01bd4 x21: 000000007ffffffe x20: ffff0000c1d01bd4 x19: ffff80001659e000 x18: 0000000000000102 x17: 0000000000000000 x16: ffff8000083008fc x15: 00000000ffffffff x14: 0000000000ff0100 x13: 0000000000000001 x12: 0000000000ff0100 x11: 0000000000000101 x10: 0000000000000000 x9 : 3e4a8f9dc3b6e100 x8 : 3e4a8f9dc3b6e100 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001b7f5fb8 x4 : ffff80001423f280 x3 : ffff800008300a0c x2 : 0000000000000001 x1 : 0000000000000101 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] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:401 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline] ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x314/0x414 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:452 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x17ec/0x2db8 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_write_xmit+0x12e0/0x4d60 net/ipv4/tcp_output.c:2707 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2892 tcp_push+0x410/0x604 net/ipv4/tcp.c:738 tcp_sendmsg_locked+0x25d0/0x2ce8 net/ipv4/tcp.c:1429 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1457 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x23c/0x31c net/socket.c:1079 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __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: 1647667 hardirqs last enabled at (1647666): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257 hardirqs last disabled at (1647667): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1647508): [] local_bh_enable+0x10/0x1d0 include/linux/bottom_half.h:31 softirqs last disabled at (1647509): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (1647509): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (1647509): [] do_softirq+0xfc/0x1b0 kernel/softirq.c:477 ---[ end trace 5acafa2e6ee5e7c3 ]---