================================================================== BUG: KASAN: use-after-free in rose_get_neigh+0x17e/0x550 net/rose/rose_route.c:692 Read of size 1 at addr ffff88802f562c30 by task syz.4.720/7508 CPU: 0 PID: 7508 Comm: syz.4.720 Not tainted 6.1.135-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x220 mm/kasan/report.c:427 kasan_report+0x10b/0x140 mm/kasan/report.c:531 rose_get_neigh+0x17e/0x550 net/rose/rose_route.c:692 rose_connect+0x412/0x1380 net/rose/af_rose.c:816 __sys_connect_file net/socket.c:2011 [inline] __sys_connect+0x389/0x410 net/socket.c:2028 __do_sys_connect net/socket.c:2038 [inline] __se_sys_connect net/socket.c:2035 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:2035 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f58cab8e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f58cba92038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f58cadb6080 RCX: 00007f58cab8e969 RDX: 000000000000001c RSI: 0000200000000040 RDI: 0000000000000008 RBP: 00007f58cac10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f58cadb6080 R15: 00007ffec22c4d88 Allocated by task 7435: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515 __netdev_alloc_skb+0x107/0x4d0 net/core/skbuff.c:579 netdev_alloc_skb include/linux/skbuff.h:3206 [inline] dev_alloc_skb include/linux/skbuff.h:3219 [inline] __ieee80211_beacon_get+0xc48/0x1f50 net/mac80211/tx.c:5260 ieee80211_beacon_get_tim+0x5b/0x4d0 net/mac80211/tx.c:5342 ieee80211_beacon_get include/net/mac80211.h:5249 [inline] mac80211_hwsim_beacon_tx+0x21c/0xae0 drivers/net/wireless/mac80211_hwsim.c:2086 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:788 ieee80211_iterate_active_interfaces_atomic+0xd7/0x170 net/mac80211/util.c:824 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2142 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x522/0xc80 kernel/time/hrtimer.c:1755 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1772 handle_softirqs+0x2a1/0x920 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 Freed by task 7435: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3674 skb_free_head net/core/skbuff.c:762 [inline] skb_release_data+0x5db/0x7c0 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] consume_skb+0xa2/0x100 net/core/skbuff.c:1035 mac80211_hwsim_beacon_tx+0x61e/0xae0 drivers/net/wireless/mac80211_hwsim.c:2116 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:788 ieee80211_iterate_active_interfaces_atomic+0xd7/0x170 net/mac80211/util.c:824 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2142 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x522/0xc80 kernel/time/hrtimer.c:1755 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1772 handle_softirqs+0x2a1/0x920 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 The buggy address belongs to the object at ffff88802f562c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of 512-byte region [ffff88802f562c00, ffff88802f562e00) The buggy address belongs to the physical page: page:ffffea0000bd5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f560 head:ffffea0000bd5800 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888017441c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 13435406801, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5606 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1271 [inline] alloc_uevent_skb+0x7d/0x230 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x17e/0x530 lib/kobject_uevent.c:412 kobject_uevent_env+0x54c/0x8a0 lib/kobject_uevent.c:608 rx_queue_add_kobject net/core/net-sysfs.c:1072 [inline] net_rx_queue_update_kobjects+0x23f/0x4a0 net/core/net-sysfs.c:1112 register_queue_kobjects net/core/net-sysfs.c:1772 [inline] netdev_register_kobject+0x223/0x310 net/core/net-sysfs.c:2017 register_netdevice+0x12b9/0x1aa0 net/core/dev.c:10192 page_owner free stack trace missing Memory state around the buggy address: ffff88802f562b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802f562b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802f562c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802f562c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802f562d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================