================================================================== BUG: KASAN: use-after-free in rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:690 Read of size 1 at addr ffff0000c9bba430 by task syz.1.665/6963 CPU: 0 PID: 6963 Comm: syz.1.665 Not tainted 5.15.186-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_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:690 rose_connect+0x350/0xffc net/rose/af_rose.c:814 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x264/0x28c net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:1947 __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 6844: 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 alloc_skb include/linux/skbuff.h:1162 [inline] alloc_uevent_skb+0x78/0x1e0 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x15c/0x53c lib/kobject_uevent.c:412 kobject_uevent_env+0x548/0x888 lib/kobject_uevent.c:608 kobject_uevent+0x2c/0x3c lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1070 [inline] net_rx_queue_update_kobjects+0x1e0/0x420 net/core/net-sysfs.c:1110 register_queue_kobjects net/core/net-sysfs.c:1767 [inline] netdev_register_kobject+0x1e4/0x2d4 net/core/net-sysfs.c:2018 register_netdevice+0xd44/0x1304 net/core/dev.c:10397 register_netdev+0x48/0x64 net/core/dev.c:10521 loopback_net_init+0x64/0x150 drivers/net/loopback.c:216 ops_init+0x2b0/0x544 net/core/net_namespace.c:138 setup_net+0x374/0xa0c net/core/net_namespace.c:333 copy_net_ns+0x2bc/0x5cc net/core/net_namespace.c:503 create_new_namespaces+0x304/0x5f8 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226 ksys_unshare+0x3d4/0x6d0 kernel/fork.c:3175 __do_sys_unshare kernel/fork.c:3249 [inline] __se_sys_unshare kernel/fork.c:3247 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3247 __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 Freed by task 6844: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x170/0x40c mm/slub.c:4559 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x3c0/0x5ac net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] consume_skb+0x138/0x33c net/core/skbuff.c:914 netlink_broadcast_filtered+0xcec/0xe64 net/netlink/af_netlink.c:1521 netlink_broadcast+0x50/0x68 net/netlink/af_netlink.c:1543 uevent_net_broadcast_tagged lib/kobject_uevent.c:372 [inline] kobject_uevent_net_broadcast+0x4a4/0x53c lib/kobject_uevent.c:412 kobject_uevent_env+0x548/0x888 lib/kobject_uevent.c:608 kobject_uevent+0x2c/0x3c lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1070 [inline] net_rx_queue_update_kobjects+0x1e0/0x420 net/core/net-sysfs.c:1110 register_queue_kobjects net/core/net-sysfs.c:1767 [inline] netdev_register_kobject+0x1e4/0x2d4 net/core/net-sysfs.c:2018 register_netdevice+0xd44/0x1304 net/core/dev.c:10397 register_netdev+0x48/0x64 net/core/dev.c:10521 loopback_net_init+0x64/0x150 drivers/net/loopback.c:216 ops_init+0x2b0/0x544 net/core/net_namespace.c:138 setup_net+0x374/0xa0c net/core/net_namespace.c:333 copy_net_ns+0x2bc/0x5cc net/core/net_namespace.c:503 create_new_namespaces+0x304/0x5f8 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226 ksys_unshare+0x3d4/0x6d0 kernel/fork.c:3175 __do_sys_unshare kernel/fork.c:3249 [inline] __se_sys_unshare kernel/fork.c:3247 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3247 __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 The buggy address belongs to the object at ffff0000c9bba400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of 512-byte region [ffff0000c9bba400, ffff0000c9bba600) The buggy address belongs to the page: page:00000000dc07f43e refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c9bb9000 pfn:0x109bb8 head:00000000dc07f43e order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003428308 fffffc0003a4ee08 ffff0000c0002600 raw: ffff0000c9bb9000 000000000010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c9bba300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c9bba380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c9bba400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c9bba480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c9bba500: fb fb 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