================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:87 [inline] BUG: KASAN: use-after-free in atomic_set include/linux/atomic/atomic-instrumented.h:41 [inline] BUG: KASAN: use-after-free in refcount_set include/linux/refcount.h:136 [inline] BUG: KASAN: use-after-free in refcount_warn_saturate+0x19/0x1a0 lib/refcount.c:15 Write of size 4 at addr ffff888073d67840 by task syz-executor.5/15670 CPU: 1 PID: 15670 Comm: syz-executor.5 Not tainted 6.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 instrument_atomic_write include/linux/instrumented.h:87 [inline] atomic_set include/linux/atomic/atomic-instrumented.h:41 [inline] refcount_set include/linux/refcount.h:136 [inline] refcount_warn_saturate+0x19/0x1a0 lib/refcount.c:15 __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] put_dev drivers/usb/gadget/legacy/inode.c:159 [inline] gadgetfs_kill_sb+0xe8/0x100 drivers/usb/gadget/legacy/inode.c:2086 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 put_fs_context+0x90/0x7a0 fs/fs_context.c:465 fscontext_release+0x61/0x80 fs/fsopen.c:73 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f436da3df8b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007fffefc0d550 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f436da3df8b RDX: 00007f436d61f440 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f436dbad980 R08: 0000000000000000 R09: 00007f436d600000 R10: 00007f436d61f448 R11: 0000000000000293 R12: 00000000000d9277 R13: 00007fffefc0d650 R14: 00007f436dbabf80 R15: 0000000000000032 Allocated by task 15674: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] dev_new drivers/usb/gadget/legacy/inode.c:170 [inline] gadgetfs_fill_super+0x2f9/0x8a0 drivers/usb/gadget/legacy/inode.c:2041 vfs_get_super fs/super.c:1169 [inline] get_tree_single+0xb4/0x160 fs/super.c:1207 vfs_get_tree+0x88/0x270 fs/super.c:1531 vfs_fsconfig_locked fs/fsopen.c:232 [inline] __do_sys_fsconfig fs/fsopen.c:439 [inline] __se_sys_fsconfig+0xbc0/0x1060 fs/fsopen.c:314 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 15682: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3674 put_dev drivers/usb/gadget/legacy/inode.c:163 [inline] gadgetfs_kill_sb+0x8a/0x100 drivers/usb/gadget/legacy/inode.c:2086 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 vfs_get_super fs/super.c:1190 [inline] get_tree_single+0xd0/0x160 fs/super.c:1207 vfs_get_tree+0x88/0x270 fs/super.c:1531 vfs_fsconfig_locked fs/fsopen.c:232 [inline] __do_sys_fsconfig fs/fsopen.c:439 [inline] __se_sys_fsconfig+0xbc0/0x1060 fs/fsopen.c:314 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888073d67800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff888073d67800, ffff888073d67c00) The buggy address belongs to the physical page: page:ffffea0001cf5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888073d63800 pfn:0x73d60 head:ffffea0001cf5800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000175ce08 ffffea0001d3d408 ffff888012841dc0 raw: ffff888073d63800 000000000010000d 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3643, tgid 3643 (syz-executor.3), ts 64158216257, free_ts 64125350958 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291 __alloc_pages+0x259/0x560 mm/page_alloc.c:5558 alloc_slab_page+0xbd/0x190 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x112/0x2b0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] nlmsg_new include/net/netlink.h:970 [inline] inet6_rt_notify+0x2c9/0x5a0 net/ipv6/route.c:6172 fib6_add_rt2node net/ipv6/ip6_fib.c:1252 [inline] fib6_add+0x1e90/0x3c70 net/ipv6/ip6_fib.c:1478 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_route_add+0x84/0x120 net/ipv6/route.c:3847 addrconf_prefix_route+0x3fd/0x5c0 net/ipv6/addrconf.c:2425 addrconf_add_linklocal+0x345/0x620 net/ipv6/addrconf.c:3217 addrconf_addr_gen+0x2c6/0x410 net/ipv6/addrconf.c:3346 addrconf_notify+0xb48/0xfe0 net/ipv6/addrconf.c:3635 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 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+0x80c/0x8f0 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2586 put_cpu_partial+0x106/0x170 mm/slub.c:2662 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x1ca/0x340 mm/slub.c:3443 __alloc_skb+0xcf/0x2b0 net/core/skbuff.c:497 alloc_skb include/linux/skbuff.h:1267 [inline] alloc_skb_with_frags+0xb4/0x780 net/core/skbuff.c:6126 sock_alloc_send_pskb+0x938/0xa70 net/core/sock.c:2719 sock_alloc_send_skb include/net/sock.h:1884 [inline] mld_newpack+0x19f/0xa30 net/ipv6/mcast.c:1748 add_grhead+0x5e/0x290 net/ipv6/mcast.c:1851 add_grec+0x14c9/0x17c0 net/ipv6/mcast.c:1989 mld_send_initial_cr+0x1f6/0x370 net/ipv6/mcast.c:2236 mld_dad_work+0x3c/0x3f0 net/ipv6/mcast.c:2262 Memory state around the buggy address: ffff888073d67700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888073d67780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888073d67800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888073d67880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073d67900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================