================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: slab-use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: slab-use-after-free in skb_unref include/linux/skbuff.h:1217 [inline] BUG: KASAN: slab-use-after-free in consume_skb+0x32/0x170 net/core/skbuff.c:1279 Read of size 4 at addr ffff88802c175864 by task kworker/1:9/5177 CPU: 1 PID: 5177 Comm: kworker/1:9 Not tainted 6.5.0-syzkaller-04025-g2861f09c1112 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events sk_psock_destroy 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:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] refcount_read include/linux/refcount.h:147 [inline] skb_unref include/linux/skbuff.h:1217 [inline] consume_skb+0x32/0x170 net/core/skbuff.c:1279 __sk_msg_free+0x230/0x380 net/core/skmsg.c:206 sk_msg_free net/core/skmsg.c:219 [inline] __sk_psock_purge_ingress_msg net/core/skmsg.c:770 [inline] __sk_psock_zap_ingress net/core/skmsg.c:783 [inline] sk_psock_destroy+0x335/0xa50 net/core/skmsg.c:815 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 worker_thread+0x687/0x1110 kernel/workqueue.c:2751 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 8195: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x185/0x3f0 mm/slub.c:3515 __alloc_skb+0x287/0x330 net/core/skbuff.c:640 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6313 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2795 unix_dgram_sendmsg+0x455/0x1c30 net/unix/af_unix.c:1953 sock_sendmsg_nosec net/socket.c:728 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:751 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2539 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2593 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2679 __do_sys_sendmmsg net/socket.c:2708 [inline] __se_sys_sendmmsg net/socket.c:2705 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2705 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5177: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] kmem_cache_free+0xf0/0x490 mm/slub.c:3823 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:1010 __kfree_skb net/core/skbuff.c:1068 [inline] kfree_skb_reason+0x10e/0x210 net/core/skbuff.c:1103 kfree_skb include/linux/skbuff.h:1234 [inline] sock_drop include/linux/skmsg.h:307 [inline] __sk_psock_zap_ingress net/core/skmsg.c:781 [inline] sk_psock_destroy+0x18d/0xa50 net/core/skmsg.c:815 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600 worker_thread+0x687/0x1110 kernel/workqueue.c:2751 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff88802c175780 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 228 bytes inside of freed 240-byte region [ffff88802c175780, ffff88802c175870) The buggy address belongs to the physical page: page:ffffea0000b05d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c175 memcg:ffff88806877ce81 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888019674500 ffffea0001ec6600 dead000000000006 raw: 0000000000000000 00000000000c000c 00000001ffffffff ffff88806877ce81 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 5045, tgid 5038 (syz-fuzzer), ts 128836527647, free_ts 114685807928 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215 __kmem_cache_alloc_bulk mm/slub.c:3966 [inline] kmem_cache_alloc_bulk+0x25a/0x7c0 mm/slub.c:4041 napi_skb_cache_get+0xf7/0x190 net/core/skbuff.c:330 __napi_build_skb+0x14/0x50 net/core/skbuff.c:509 __napi_alloc_skb+0x3a7/0x6f0 net/core/skbuff.c:828 napi_alloc_skb include/linux/skbuff.h:3282 [inline] page_to_skb+0x150/0xac0 drivers/net/virtio_net.c:526 receive_mergeable drivers/net/virtio_net.c:1487 [inline] receive_buf+0x11c0/0x52d0 drivers/net/virtio_net.c:1608 virtnet_receive drivers/net/virtio_net.c:1906 [inline] virtnet_poll+0x772/0x1530 drivers/net/virtio_net.c:1978 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6527 napi_poll net/core/dev.c:6594 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6727 __do_softirq+0x218/0x965 kernel/softirq.c:553 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443 __folio_put_large mm/swap.c:119 [inline] __folio_put+0x10a/0x140 mm/swap.c:127 folio_put include/linux/mm.h:1440 [inline] put_page include/linux/mm.h:1509 [inline] napi_frag_unref include/linux/skbuff.h:3450 [inline] skb_release_data+0x559/0x870 net/core/skbuff.c:981 skb_release_all net/core/skbuff.c:1053 [inline] __kfree_skb net/core/skbuff.c:1067 [inline] skb_attempt_defer_free+0x3bc/0x570 net/core/skbuff.c:6817 tcp_eat_recv_skb net/ipv4/tcp.c:1507 [inline] tcp_recvmsg_locked+0x123c/0x24b0 net/ipv4/tcp.c:2523 tcp_recvmsg+0x12e/0x670 net/ipv4/tcp.c:2569 inet_recvmsg+0x114/0x640 net/ipv4/af_inet.c:872 sock_recvmsg_nosec net/socket.c:1025 [inline] sock_recvmsg+0xe2/0x170 net/socket.c:1047 sock_read_iter+0x2c3/0x3c0 net/socket.c:1117 call_read_iter include/linux/fs.h:1979 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ef/0x930 fs/read_write.c:470 ksys_read+0x1f0/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88802c175700: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88802c175780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802c175800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88802c175880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88802c175900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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