================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:184 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:774 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 Write of size 4 at addr ffff88805c85f080 by task kworker/1:5/29719 CPU: 1 PID: 29719 Comm: kworker/1:5 Not tainted 6.9.0-rc2-next-20240405-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] sock_hold include/net/sock.h:774 [inline] sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 3343: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4078 [inline] kmalloc_node_track_caller_noprof+0x22a/0x440 mm/slub.c:4098 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1313 [inline] _sctp_make_chunk+0x58/0x460 net/sctp/sm_make_chunk.c:1443 sctp_make_data net/sctp/sm_make_chunk.c:1475 [inline] sctp_make_datafrag_empty+0xa6/0x510 net/sctp/sm_make_chunk.c:740 sctp_datamsg_from_user+0x740/0xf20 net/sctp/chunk.c:262 sctp_sendmsg_to_asoc+0xf7e/0x1800 net/sctp/socket.c:1859 sctp_sendmsg+0x1bc3/0x3520 net/sctp/socket.c:2031 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:745 sock_sendmsg+0x134/0x200 net/socket.c:768 splice_to_socket+0xa13/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd77/0x1900 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Freed by task 3341: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2190 [inline] slab_free mm/slub.c:4393 [inline] kfree+0x149/0x350 mm/slub.c:4514 skb_kfree_head net/core/skbuff.c:1071 [inline] skb_free_head net/core/skbuff.c:1083 [inline] skb_release_data+0x690/0x890 net/core/skbuff.c:1110 skb_release_all net/core/skbuff.c:1175 [inline] __kfree_skb net/core/skbuff.c:1189 [inline] consume_skb+0xb1/0x160 net/core/skbuff.c:1405 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1503 [inline] sctp_chunk_put+0x17a/0x200 net/sctp/sm_make_chunk.c:1530 sctp_datamsg_put+0x42b/0x560 net/sctp/chunk.c:128 sctp_chunk_free+0x4a/0x60 net/sctp/sm_make_chunk.c:1515 __sctp_outq_teardown+0x7c6/0x9b0 net/sctp/outqueue.c:257 sctp_association_free+0x21a/0x7b0 net/sctp/associola.c:339 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1330 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x4393/0x60c0 net/sctp/sm_sideeffect.c:1169 sctp_primitive_SHUTDOWN+0x98/0xc0 net/sctp/primitive.c:89 sctp_close+0x3cd/0x920 net/sctp/socket.c:1528 inet_release+0x17d/0x200 net/ipv4/af_inet.c:437 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x406/0x8b0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a The buggy address belongs to the object at ffff88805c85f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88805c85f000, ffff88805c85f800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805c85a000 pfn:0x5c858 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000240(workingset|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000240 ffff888015042000 ffffea000186f810 ffffea00008eca10 raw: ffff88805c85a000 0000000000080001 00000001ffffefff 0000000000000000 head: 00fff80000000240 ffff888015042000 ffffea000186f810 ffffea00008eca10 head: ffff88805c85a000 0000000000080001 00000001ffffefff 0000000000000000 head: 00fff80000000003 ffffea0001721601 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5484, tgid -1313926663 (kworker/1:12), ts 5484, free_ts 947856760437 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3624 __slab_alloc+0x58/0xa0 mm/slub.c:3714 __slab_alloc_node mm/slub.c:3767 [inline] slab_alloc_node mm/slub.c:3945 [inline] __do_kmalloc_node mm/slub.c:4077 [inline] kmalloc_node_track_caller_noprof+0x286/0x440 mm/slub.c:4098 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1313 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6477 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2795 sock_alloc_send_skb include/net/sock.h:1842 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 mld_send_cr net/ipv6/mcast.c:2113 [inline] mld_ifc_work+0x68e/0xd90 net/ipv6/mcast.c:2650 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 page last free pid 32450 tgid 32450 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617 __folio_put_large+0x168/0x1d0 mm/swap.c:132 __folio_put+0x299/0x390 mm/swap.c:140 page_to_skb+0x3d7/0x9b0 drivers/net/virtio_net.c:671 receive_mergeable drivers/net/virtio_net.c:1699 [inline] receive_buf+0x3b3/0x3890 drivers/net/virtio_net.c:1820 virtnet_receive drivers/net/virtio_net.c:2126 [inline] virtnet_poll+0x850/0x1ad0 drivers/net/virtio_net.c:2219 __napi_poll+0xcb/0x490 net/core/dev.c:6701 napi_poll net/core/dev.c:6770 [inline] net_rx_action+0x7bb/0x10a0 net/core/dev.c:6886 __do_softirq+0x2c6/0x980 kernel/softirq.c:554 Memory state around the buggy address: ffff88805c85ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805c85f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805c85f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805c85f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805c85f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================