================================================================== BUG: KASAN: use-after-free in rose_timer_expiry+0x40c/0x470 net/rose/rose_timer.c:183 Read of size 2 at addr ffff0000e99ac82a by task syz.3.713/7070 CPU: 1 PID: 7070 Comm: syz.3.713 Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307 rose_timer_expiry+0x40c/0x470 net/rose/rose_timer.c:183 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 check_region_inline mm/kasan/generic.c:175 [inline] kasan_check_range+0x34/0x2b0 mm/kasan/generic.c:189 __kasan_check_read+0x44/0x54 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] lru_cache_disabled include/linux/swap.h:355 [inline] pagevec_add_and_need_flush mm/swap.c:223 [inline] lru_cache_add+0x440/0x6e4 mm/swap.c:452 shmem_getpage_gfp+0x12ec/0x1ef0 mm/shmem.c:1945 shmem_getpage mm/shmem.c:151 [inline] shmem_write_begin+0xe0/0x29c mm/shmem.c:2474 generic_perform_write+0x204/0x480 mm/filemap.c:3785 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912 generic_file_write_iter+0xb0/0x1b4 mm/filemap.c:3944 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 Allocated by task 5985: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc_node_track_caller+0x234/0x3bc mm/slub.c:4963 kmalloc_reserve+0xe4/0x26c net/core/skbuff.c:356 __alloc_skb+0x23c/0x67c net/core/skbuff.c:427 __netdev_alloc_skb+0xb4/0x3b8 net/core/skbuff.c:494 netdev_alloc_skb include/linux/skbuff.h:3001 [inline] dev_alloc_skb include/linux/skbuff.h:3014 [inline] __ieee80211_beacon_get+0x934/0x19dc net/mac80211/tx.c:5080 ieee80211_beacon_get_tim+0x5c/0x790 net/mac80211/tx.c:5194 ieee80211_beacon_get include/net/mac80211.h:4981 [inline] mac80211_hwsim_beacon_tx+0x10c/0x7ac drivers/net/wireless/mac80211_hwsim.c:1812 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:829 mac80211_hwsim_beacon+0x90/0x174 drivers/net/wireless/mac80211_hwsim.c:1865 __run_hrtimer kernel/time/hrtimer.c:1690 [inline] __hrtimer_run_queues+0x428/0xb6c kernel/time/hrtimer.c:1754 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1771 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 The buggy address belongs to the object at ffff0000e99ac800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 42 bytes inside of 512-byte region [ffff0000e99ac800, ffff0000e99aca00) The buggy address belongs to the page: page:00000000e5e88218 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000e99ac800 pfn:0x1299ac head:00000000e5e88218 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003a6cc08 fffffc00039c4808 ffff0000c0002600 raw: ffff0000e99ac800 0000000000100002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e99ac700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e99ac780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000e99ac800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e99ac880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e99ac900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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