================================================================== BUG: KASAN: use-after-free in rose_get_neigh+0x17e/0x550 net/rose/rose_route.c:690 Read of size 1 at addr ffff8880175f4c30 by task syz.3.319/5532 CPU: 0 PID: 5532 Comm: syz.3.319 Not tainted 5.15.181-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 rose_get_neigh+0x17e/0x550 net/rose/rose_route.c:690 rose_connect+0x412/0x1370 net/rose/af_rose.c:814 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x389/0x410 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1947 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f9a362e4969 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:00007f9a3414c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f9a3650bfa0 RCX: 00007f9a362e4969 RDX: 000000000000001c RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f9a36366ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9a3650bfa0 R15: 00007ffe2d4308c8 Allocated by task 5357: 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+0xb5/0xf0 mm/kasan/common.c:522 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1162 [inline] alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170 sock_alloc_send_pskb+0x853/0x980 net/core/sock.c:2531 __ip6_append_data+0x257b/0x3810 net/ipv6/ip6_output.c:1663 ip6_make_skb+0x3af/0x4c0 net/ipv6/ip6_output.c:2031 udpv6_sendmsg+0x1aa6/0x2670 net/ipv6/udp.c:1580 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmmsg+0x27c/0x4a0 net/socket.c:2576 __do_sys_sendmmsg net/socket.c:2605 [inline] __se_sys_sendmmsg net/socket.c:2602 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 5357: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xef/0x2a0 mm/slub.c:4559 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x6fe/0x850 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] kfree_skb_reason+0xaf/0x110 net/core/skbuff.c:776 ip6_pkt_discard_out+0xee/0x110 net/ipv6/route.c:4549 ip6_send_skb+0x1b9/0x360 net/ipv6/ip6_output.c:1951 udp_v6_send_skb+0xa28/0x1680 net/ipv6/udp.c:1285 udpv6_sendmsg+0x1ae8/0x2670 net/ipv6/udp.c:1586 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmmsg+0x27c/0x4a0 net/socket.c:2576 __do_sys_sendmmsg net/socket.c:2605 [inline] __se_sys_sendmmsg net/socket.c:2602 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8880175f4c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of 512-byte region [ffff8880175f4c00, ffff8880175f4e00) The buggy address belongs to the page: page:ffffea00005d7d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880175f6c00 pfn:0x175f4 head:ffffea00005d7d00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001891a08 ffffea000082ef08 ffff888016841c80 raw: ffff8880175f6c00 000000000010000c 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, ts 2159390686, free_ts 1920329746 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2031 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3245 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] cryptomgr_schedule_test crypto/algboss.c:205 [inline] cryptomgr_notify+0x87/0x940 crypto/algboss.c:240 notifier_call_chain kernel/notifier.c:83 [inline] blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:318 crypto_probing_notify+0x21/0x70 crypto/api.c:251 crypto_wait_for_test+0x3f/0xd0 crypto/algapi.c:408 crypto_register_alg+0x263/0x340 crypto/algapi.c:441 do_one_initcall+0x1ee/0x680 init/main.c:1302 do_initcall_level+0x137/0x1f0 init/main.c:1375 do_initcalls+0x4b/0x90 init/main.c:1391 kernel_init_freeable+0x3ce/0x560 init/main.c:1615 kernel_init+0x19/0x1b0 init/main.c:1506 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 stack_depot_save+0x418/0x440 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb3/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3233 sock_alloc_inode+0x17/0xb0 net/socket.c:303 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x5f/0x210 fs/inode.c:1001 sock_alloc net/socket.c:626 [inline] sock_create_lite+0x87/0x500 net/socket.c:1285 __netlink_kernel_create+0xf4/0x7d0 net/netlink/af_netlink.c:2028 netlink_kernel_create include/linux/netlink.h:62 [inline] rtnetlink_net_init+0x9b/0x120 net/core/rtnetlink.c:5726 ops_init+0x357/0x600 net/core/net_namespace.c:138 __register_pernet_operations net/core/net_namespace.c:1203 [inline] register_pernet_operations+0x2a3/0x5f0 net/core/net_namespace.c:1276 register_pernet_subsys+0x24/0x40 net/core/net_namespace.c:1317 rtnetlink_init+0x12/0x1f0 net/core/rtnetlink.c:5746 netlink_proto_init+0xf9/0x180 net/netlink/af_netlink.c:2891 Memory state around the buggy address: ffff8880175f4b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880175f4b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880175f4c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880175f4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880175f4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================