================================================================== BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127 Read of size 1 at addr ffff8880292e9424 by task syz-executor.5/21267 CPU: 0 PID: 21267 Comm: syz-executor.5 Not tainted 6.7.0-rc6-next-20231222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127 __key_create_or_update+0x453/0xdf0 security/keys/key.c:842 key_create_or_update+0x42/0x50 security/keys/key.c:1007 __do_sys_add_key+0x29c/0x450 security/keys/keyctl.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7fc9dd47cce9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc9de16c0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007fc9dd59bf80 RCX: 00007fc9dd47cce9 RDX: 0000000020000080 RSI: 0000000000000000 RDI: 00000000200003c0 RBP: 00007fc9dd4c947a R08: 000000001000f52d R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fc9dd59bf80 R15: 00007ffe7b59c308 Allocated by task 21267: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_set_track+0x24/0x30 mm/kasan/common.c:61 poison_kmalloc_redzone mm/kasan/common.c:340 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:357 kasan_kmalloc include/linux/kasan.h:210 [inline] __do_kmalloc_node mm/slub.c:3985 [inline] __kmalloc_node+0x226/0x480 mm/slub.c:3992 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:634 kvmalloc include/linux/slab.h:728 [inline] __do_sys_add_key+0x1f8/0x450 security/keys/keyctl.c:116 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a The buggy address belongs to the object at ffff8880292e9420 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 4-byte region [ffff8880292e9420, ffff8880292e9424) The buggy address belongs to the physical page: page:ffffea0000a4ba40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x292e9 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888013041280 dead000000000100 dead000000000122 raw: 0000000000000000 00000000802a002a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 9538, tgid 9538 (kworker/0:19), ts 438827167849, free_ts 438807073500 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa19/0x3740 mm/page_alloc.c:3348 __alloc_pages+0x22e/0x2410 mm/page_alloc.c:4604 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:2191 [inline] allocate_slab mm/slub.c:2358 [inline] new_slab+0x283/0x3c0 mm/slub.c:2411 ___slab_alloc+0x4ab/0x1990 mm/slub.c:3544 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3629 __slab_alloc_node mm/slub.c:3682 [inline] slab_alloc_node mm/slub.c:3854 [inline] kmalloc_trace+0x2ff/0x330 mm/slub.c:4011 kmalloc include/linux/slab.h:590 [inline] usb_control_msg+0xbd/0x4a0 drivers/usb/core/message.c:144 usb_clear_port_feature drivers/usb/core/hub.c:453 [inline] hub_port_reset+0x734/0x1cc0 drivers/usb/core/hub.c:3006 hub_port_init+0x1f6/0x39e0 drivers/usb/core/hub.c:4838 hub_port_connect drivers/usb/core/hub.c:5394 [inline] hub_port_connect_change drivers/usb/core/hub.c:5605 [inline] port_event drivers/usb/core/hub.c:5765 [inline] hub_event+0x2b61/0x4e10 drivers/usb/core/hub.c:5847 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 page last free pid 9537 tgid 9537 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2383 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2523 vfree+0x181/0x7a0 mm/vmalloc.c:2842 delayed_vfree_work+0x56/0x70 mm/vmalloc.c:2763 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff8880292e9300: fb fc fc fc fc fc fc fc fc fc fc fc fb fc fc fc ffff8880292e9380: fc fc fc fc fc fc fc fc fb fc fc fc fc fc fc fc >ffff8880292e9400: fc fc fc fc 04 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880292e9480: fb fc fc fc fc fc fc fc fc fc fc fc fb fc fc fc ffff8880292e9500: fc fc fc fc fc fc fc fc fa fc fc fc fc fc fc fc ==================================================================