================================================================== BUG: KASAN: use-after-free in xfs_btree_lookup_get_block+0x15c/0x6d0 fs/xfs/libxfs/xfs_btree.c:1813 Read of size 8 at addr ffff8880209dc790 by task syz-executor.5/20134 CPU: 0 PID: 20134 Comm: syz-executor.5 Not tainted 6.2.0-rc4-syzkaller-00041-gc1649ec55708 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x1f0 mm/kasan/report.c:417 kasan_report+0xcd/0x100 mm/kasan/report.c:517 xfs_btree_lookup_get_block+0x15c/0x6d0 fs/xfs/libxfs/xfs_btree.c:1813 xfs_btree_lookup+0x346/0x12c0 fs/xfs/libxfs/xfs_btree.c:1913 xfs_btree_simple_query_range+0xde/0x6a0 fs/xfs/libxfs/xfs_btree.c:4718 xfs_btree_query_range+0x2db/0x380 fs/xfs/libxfs/xfs_btree.c:4958 xfs_refcount_recover_cow_leftovers+0x2d1/0xa60 fs/xfs/libxfs/xfs_refcount.c:1946 xfs_reflink_recover_cow+0xab/0x1b0 fs/xfs/xfs_reflink.c:928 xlog_recover_finish+0x824/0x920 fs/xfs/xfs_log_recover.c:3493 xfs_log_mount_finish+0x1ec/0x3d0 fs/xfs/xfs_log.c:829 xfs_mountfs+0x146a/0x1ef0 fs/xfs/xfs_mount.c:933 xfs_fs_fill_super+0xf95/0x11f0 fs/xfs/xfs_super.c:1666 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 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 RIP: 0033:0x7ff50fa8d5fa Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff51084af88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000000097a0 RCX: 00007ff50fa8d5fa RDX: 0000000020000040 RSI: 0000000020000180 RDI: 00007ff51084afe0 RBP: 00007ff51084b020 R08: 00007ff51084b020 R09: 0000000000800003 R10: 0000000000800003 R11: 0000000000000202 R12: 0000000020000040 R13: 0000000020000180 R14: 00007ff51084afe0 R15: 0000000020000080 Allocated by task 7080: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] kmem_cache_alloc_node+0x1dc/0x390 mm/slub.c:3497 __alloc_skb+0xd7/0x2c0 net/core/skbuff.c:552 alloc_skb include/linux/skbuff.h:1270 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x268/0xaa0 drivers/net/netdevsim/dev.c:853 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 7080: 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:518 ____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:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x94/0x1d0 mm/slub.c:3809 nsim_dev_trap_report drivers/net/netdevsim/dev.c:824 [inline] nsim_dev_trap_report_work+0x767/0xaa0 drivers/net/netdevsim/dev.c:853 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff8880209dc780 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 16 bytes inside of 240-byte region [ffff8880209dc780, ffff8880209dc870) The buggy address belongs to the physical page: page:ffffea0000827700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x209dc anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff888017816500 ffffea00009e04c0 dead000000000005 raw: 0000000000000000 00000000000c000c 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5057, tgid 5057 (sshd), ts 2895812029435, free_ts 2895811927081 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x268/0x350 mm/slub.c:3476 skb_clone+0x1e0/0x360 net/core/skbuff.c:1714 dev_queue_xmit_nit+0x200/0xbe0 net/core/dev.c:2258 xmit_one net/core/dev.c:3579 [inline] dev_hard_start_xmit+0x120/0x3e0 net/core/dev.c:3599 sch_direct_xmit+0x2ae/0x5e0 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3810 [inline] __dev_queue_xmit+0x1a55/0x3a30 net/core/dev.c:4215 dev_queue_xmit include/linux/netdevice.h:3035 [inline] neigh_hh_output include/net/neighbour.h:530 [inline] neigh_output include/net/neighbour.h:544 [inline] ip_finish_output2+0xc3a/0x1160 net/ipv4/ip_output.c:228 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x11b2/0x1bf0 net/ipv4/ip_output.c:532 __tcp_transmit_skb+0x1ddb/0x3370 net/ipv4/tcp_output.c:1399 tcp_transmit_skb net/ipv4/tcp_output.c:1417 [inline] tcp_write_xmit+0x1adc/0x65a0 net/ipv4/tcp_output.c:2693 __tcp_push_pending_frames+0x8e/0x260 net/ipv4/tcp_output.c:2877 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 skb_free_frag include/linux/skbuff.h:3193 [inline] skb_free_head net/core/skbuff.c:820 [inline] skb_release_data+0x5d9/0x710 net/core/skbuff.c:851 skb_release_all net/core/skbuff.c:916 [inline] __kfree_skb+0x5b/0x1d0 net/core/skbuff.c:930 tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline] tcp_recvmsg_locked+0x14ab/0x25c0 net/ipv4/tcp.c:2633 tcp_recvmsg+0x337/0x870 net/ipv4/tcp.c:2679 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2183 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ac/0xbf0 fs/read_write.c:470 ksys_read+0x177/0x2a0 fs/read_write.c:613 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 Memory state around the buggy address: ffff8880209dc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880209dc700: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc >ffff8880209dc780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880209dc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff8880209dc880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================