================================================================== BUG: KASAN: use-after-free in rose_timer_expiry+0x404/0x45c net/rose/rose_timer.c:183 Read of size 2 at addr ffff0000f683342a by task syz.0.871/8672 CPU: 0 PID: 8672 Comm: syz.0.871 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349 rose_timer_expiry+0x404/0x45c net/rose/rose_timer.c:183 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+0x30/0x48 arch/arm64/kernel/entry.S:897 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_enable arch/arm64/include/asm/irqflags.h:35 [inline] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] finish_lock_switch+0xb8/0x1c4 kernel/sched/core.c:5003 finish_task_switch+0x120/0x620 kernel/sched/core.c:5121 context_switch kernel/sched/core.c:5247 [inline] __schedule+0xde0/0x1b18 kernel/sched/core.c:6561 preempt_schedule_common+0xec/0x1a0 kernel/sched/core.c:6730 preempt_schedule+0x64/0x84 kernel/sched/core.c:6754 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xa8/0xac kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] __wake_up_common_lock kernel/sched/wait.c:140 [inline] __wake_up_sync_key+0x11c/0x178 kernel/sched/wait.c:208 __unix_dgram_recvmsg+0x378/0xae8 net/unix/af_unix.c:2478 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2548 sock_recvmsg_nosec net/socket.c:1022 [inline] ____sys_recvmsg+0x62c/0x71c net/socket.c:2736 ___sys_recvmsg net/socket.c:2780 [inline] do_recvmmsg+0x364/0x96c net/socket.c:2874 __sys_recvmmsg net/socket.c:2953 [inline] __do_sys_recvmmsg net/socket.c:2976 [inline] __se_sys_recvmmsg net/socket.c:2969 [inline] __arm64_sys_recvmmsg+0x17c/0x238 net/socket.c:2969 __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 Allocated by task 6050: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] rose_add_node+0x1f4/0xba4 net/rose/rose_route.c:85 rose_rt_ioctl+0xa04/0xde4 net/rose/rose_route.c:740 rose_ioctl+0x378/0xb80 net/rose/af_rose.c:1380 sock_do_ioctl+0xf8/0x240 net/socket.c:1204 sock_ioctl+0x5c4/0x840 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __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 The buggy address belongs to the object at ffff0000f6833400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 42 bytes inside of 512-byte region [ffff0000f6833400, ffff0000f6833600) The buggy address belongs to the physical page: page:00000000e4f26e2d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f6833400 pfn:0x136830 head:00000000e4f26e2d order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00035b8708 fffffc0003d70b08 ffff0000c0002600 raw: ffff0000f6833400 0000000000100005 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f6833300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6833380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f6833400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f6833480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f6833500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================