================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6 net/xfrm/xfrm_policy.c:3410 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_decode_session+0x140c/0x1ad4 net/xfrm/xfrm_policy.c:3517 Read of size 1 at addr ffff0000d9f9fa26 by task syz.3.731/6485 CPU: 1 PID: 6485 Comm: syz.3.731 Not tainted 5.15.184-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 decode_session6 net/xfrm/xfrm_policy.c:3410 [inline] __xfrm_decode_session+0x140c/0x1ad4 net/xfrm/xfrm_policy.c:3517 xfrm_decode_session_reverse include/net/xfrm.h:1177 [inline] icmpv6_route_lookup+0x310/0x470 net/ipv6/icmp.c:394 icmp6_send+0xbd0/0x144c net/ipv6/icmp.c:601 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x44/0x4a8 net/ipv6/route.c:2788 dst_link_failure include/net/dst.h:422 [inline] ip6_tnl_xmit+0x6d4/0x20b4 net/ipv6/ip6_tunnel.c:1275 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1391 [inline] ip6_tnl_start_xmit+0xba0/0x10cc net/ipv6/ip6_tunnel.c:1440 __netdev_start_xmit include/linux/netdevice.h:5027 [inline] netdev_start_xmit include/linux/netdevice.h:5041 [inline] xmit_one net/core/dev.c:3649 [inline] dev_hard_start_xmit+0x2a8/0x87c net/core/dev.c:3665 sch_direct_xmit+0x2a4/0x3bc net/sched/sch_generic.c:342 qdisc_restart net/sched/sch_generic.c:407 [inline] __qdisc_run+0x85c/0x1170 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3942 [inline] __dev_queue_xmit+0xfe0/0x2800 net/core/dev.c:4253 dev_queue_xmit+0x24/0x34 net/core/dev.c:4321 neigh_connected_output+0x32c/0x370 net/core/neighbour.c:1533 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x12d0/0x1a14 net/ipv6/ip6_output.c:130 ip6_fragment+0x14c8/0x22e4 net/ipv6/ip6_output.c:998 __ip6_finish_output+0x550/0x6dc net/ipv6/ip6_output.c:199 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x274/0x500 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:452 [inline] ip6_local_out+0x120/0x15c net/ipv6/output_core.c:161 ip6_send_skb+0x1a8/0x4f4 net/ipv6/ip6_output.c:1951 ip6_push_pending_frames+0xd0/0x118 net/ipv6/ip6_output.c:1972 rawv6_push_pending_frames+0x508/0x694 net/ipv6/raw.c:617 rawv6_sendmsg+0xe58/0x12e8 net/ipv6/raw.c:961 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x61c/0x920 net/socket.c:2436 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526 __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 4019: 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+0x298/0x44c mm/slub.c:4407 kmalloc include/linux/slab.h:609 [inline] tomoyo_realpath_from_path+0xcc/0x510 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1b4/0x440 security/tomoyo/file.c:822 tomoyo_path_truncate+0x28/0x38 security/tomoyo/tomoyo.c:134 security_path_truncate+0xd8/0x124 security/security.c:1214 handle_truncate fs/namei.c:3263 [inline] do_open fs/namei.c:3612 [inline] path_openat+0x20cc/0x26e4 fs/namei.c:3742 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __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 4019: 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 tomoyo_realpath_from_path+0x4c8/0x510 security/tomoyo/realpath.c:291 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1b4/0x440 security/tomoyo/file.c:822 tomoyo_path_truncate+0x28/0x38 security/tomoyo/tomoyo.c:134 security_path_truncate+0xd8/0x124 security/security.c:1214 handle_truncate fs/namei.c:3263 [inline] do_open fs/namei.c:3612 [inline] path_openat+0x20cc/0x26e4 fs/namei.c:3742 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __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 ffff0000d9f9e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2598 bytes to the right of 4096-byte region [ffff0000d9f9e000, ffff0000d9f9f000) The buggy address belongs to the page: page:0000000034058c4c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119f98 head:0000000034058c4c order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002a80 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d9f9f900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d9f9f980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d9f9fa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d9f9fa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d9f9fb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================