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BUG: KASAN: use-after-free in rose_get_neigh+0x1a4/0x5ac net/rose/rose_route.c:692
Read of size 1 at addr ffff0000f5f53030 by task syz.2.777/7372

CPU: 1 PID: 7372 Comm: syz.2.777 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348
 rose_get_neigh+0x1a4/0x5ac net/rose/rose_route.c:692
 rose_connect+0x3b8/0xe44 net/rose/af_rose.c:816
 __sys_connect_file net/socket.c:2011 [inline]
 __sys_connect+0x268/0x290 net/socket.c:2028
 __do_sys_connect net/socket.c:2038 [inline]
 __se_sys_connect net/socket.c:2035 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2035
 __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+0x58/0x168 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 6850:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 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+0xd0/0x1c0 mm/slab_common.c:956
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x180/0x324 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1271 [inline]
 ndisc_alloc_skb+0x9c/0x400 net/ipv6/ndisc.c:423
 ndisc_send_rs+0x22c/0x4e0 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x300/0x58c net/ipv6/addrconf.c:3982
 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x554/0x718 kernel/time/timer.c:1820
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833
 handle_softirqs+0x318/0xd58 kernel/softirq.c:578
 __do_softirq+0x14/0x20 kernel/softirq.c:612

Freed by task 15:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
 kfree+0xcc/0x1b8 mm/slab_common.c:988
 skb_free_head net/core/skbuff.c:762 [inline]
 skb_release_data+0x488/0x6b0 net/core/skbuff.c:791
 skb_release_all net/core/skbuff.c:856 [inline]
 __kfree_skb net/core/skbuff.c:870 [inline]
 kfree_skb_reason+0x1a4/0x47c net/core/skbuff.c:893
 kfree_skb include/linux/skbuff.h:1220 [inline]
 ip6_mc_input+0x950/0xb20 net/ipv6/ip6_input.c:589
 dst_input include/net/dst.h:463 [inline]
 ip6_rcv_finish+0x1f4/0x220 net/ipv6/ip6_input.c:79
 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
 __netif_receive_skb+0x18c/0x400 net/core/dev.c:5683
 process_backlog+0x410/0x784 net/core/dev.c:6011
 __napi_poll+0xb4/0x3f0 net/core/dev.c:6578
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5cc/0xd3c net/core/dev.c:6759
 handle_softirqs+0x318/0xd58 kernel/softirq.c:578
 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:945
 smpboot_thread_fn+0x4b0/0x96c kernel/smpboot.c:164
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

The buggy address belongs to the object at ffff0000f5f53000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 48 bytes inside of
 512-byte region [ffff0000f5f53000, ffff0000f5f53200)

The buggy address belongs to the physical page:
page:00000000f1ef33c6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x135f50
head:00000000f1ef33c6 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002600
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f5f52f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000f5f52f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000f5f53000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000f5f53080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000f5f53100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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