RDX: 0000000000000000 RSI: 000000404000f000 RDI: 0000200000000080 RBP: 00007fe12e411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe12e5e5fa0 R14: 00007fe12e5e5fa0 R15: 0000000000000002 ================================================================== BUG: KASAN: slab-out-of-bounds in udf_get_fileshortad+0x152/0x1a0 fs/udf/directory.c:497 Read of size 4 at addr ffff88807706f738 by task syz.0.17/4432 CPU: 0 PID: 4432 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 udf_get_fileshortad+0x152/0x1a0 fs/udf/directory.c:497 udf_current_aext+0x43a/0xb00 fs/udf/inode.c:2122 udf_next_aext+0x101/0x450 fs/udf/inode.c:2057 udf_extend_file fs/udf/inode.c:549 [inline] udf_setsize+0x9f7/0x1090 fs/udf/inode.c:1147 udf_setattr+0x404/0x560 fs/udf/file.c:279 notify_change+0xc74/0xf40 fs/attr.c:499 do_truncate+0x197/0x220 fs/open.c:65 vfs_truncate+0x262/0x2f0 fs/open.c:111 do_sys_truncate+0xdc/0x190 fs/open.c:134 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: 0033:0x7fe12e38efc9 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:00007ffd62883da8 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fe12e5e5fa0 RCX: 00007fe12e38efc9 RDX: 0000000000000000 RSI: 000000404000f000 RDI: 0000200000000080 RBP: 00007fe12e411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe12e5e5fa0 R14: 00007fe12e5e5fa0 R15: 0000000000000002 Allocated by task 7: 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 alloc_skb include/linux/skbuff.h:1271 [inline] nlmsg_new include/net/netlink.h:991 [inline] inet6_rt_notify+0xb0/0x240 net/ipv6/route.c:6239 fib6_add_rt2node net/ipv6/ip6_fib.c:1261 [inline] fib6_add+0x1d88/0x3cc0 net/ipv6/ip6_fib.c:1490 __ip6_ins_rt net/ipv6/route.c:1345 [inline] ip6_ins_rt+0xc5/0x110 net/ipv6/route.c:1355 __ipv6_ifa_notify+0x4c1/0xdb0 net/ipv6/addrconf.c:6214 ipv6_ifa_notify net/ipv6/addrconf.c:6253 [inline] addrconf_dad_completed+0x17d/0xcf0 net/ipv6/addrconf.c:4257 addrconf_dad_work+0xc3e/0x14d0 net/ipv6/addrconf.c:-1 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 7: 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:1729 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700 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 netlink_broadcast+0xfd6/0x10d0 net/netlink/af_netlink.c:1521 nlmsg_multicast include/net/netlink.h:1071 [inline] nlmsg_notify+0xe7/0x1a0 net/netlink/af_netlink.c:2554 fib6_add_rt2node net/ipv6/ip6_fib.c:1261 [inline] fib6_add+0x1d88/0x3cc0 net/ipv6/ip6_fib.c:1490 __ip6_ins_rt net/ipv6/route.c:1345 [inline] ip6_ins_rt+0xc5/0x110 net/ipv6/route.c:1355 __ipv6_ifa_notify+0x4c1/0xdb0 net/ipv6/addrconf.c:6214 ipv6_ifa_notify net/ipv6/addrconf.c:6253 [inline] addrconf_dad_completed+0x17d/0xcf0 net/ipv6/addrconf.c:4257 addrconf_dad_work+0xc3e/0x14d0 net/ipv6/addrconf.c:-1 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807706f000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 824 bytes to the right of 1024-byte region [ffff88807706f000, ffff88807706f400) The buggy address belongs to the physical page: page:ffffea0001dc1a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77068 head:ffffea0001dc1a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888017441dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4117, tgid 4117 (sshd-session), ts 48668511464, free_ts 48662109353 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:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1230 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __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_fclone include/linux/skbuff.h:1321 [inline] tcp_stream_alloc_skb+0x3e/0x330 net/ipv4/tcp.c:869 tcp_sendmsg_locked+0xd1c/0x3f10 net/ipv4/tcp.c:1332 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1490 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] sock_write_iter+0x2b5/0x3a0 net/socket.c:1143 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 __skb_frag_unref include/linux/skbuff.h:3459 [inline] skb_release_data+0x499/0x7c0 net/core/skbuff.c:785 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] skb_attempt_defer_free+0x107/0x410 net/core/skbuff.c:6676 tcp_eat_recv_skb net/ipv4/tcp.c:1661 [inline] tcp_recvmsg_locked+0x1190/0x22f0 net/ipv4/tcp.c:2674 tcp_recvmsg+0x212/0x810 net/ipv4/tcp.c:2720 inet_recvmsg+0x12c/0x1e0 net/ipv4/af_inet.c:890 sock_recvmsg_nosec net/socket.c:1022 [inline] sock_recvmsg net/socket.c:1040 [inline] sock_read_iter+0x2bf/0x370 net/socket.c:1121 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x434/0x920 fs/read_write.c:470 ksys_read+0x143/0x240 fs/read_write.c:613 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 Memory state around the buggy address: ffff88807706f600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807706f680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807706f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807706f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807706f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================