================================================================== BUG: KASAN: use-after-free in bdev_free_inode+0xe3/0x1d0 block/bdev.c:407 Read of size 8 at addr ffff88801da6e148 by task ksoftirqd/1/19 CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 bdev_free_inode+0xe3/0x1d0 block/bdev.c:407 rcu_do_batch kernel/rcu/tree.c:2508 [inline] rcu_core+0x9b8/0x1610 kernel/rcu/tree.c:2743 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:920 smpboot_thread_fn+0x533/0x9d0 kernel/smpboot.c:164 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Allocated by task 9373: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_node_trace+0x269/0x350 mm/slub.c:3261 kmalloc_node include/linux/slab.h:609 [inline] kzalloc_node include/linux/slab.h:732 [inline] __alloc_disk_node+0x6b/0x470 block/genhd.c:1238 __blk_mq_alloc_disk+0xe2/0x150 block/blk-mq.c:3140 loop_add+0x2a7/0x880 drivers/block/loop.c:2344 loop_control_ioctl+0x12a/0x730 drivers/block/loop.c:2512 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 9373: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x129/0x1a0 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kfree+0xcf/0x2f0 mm/slub.c:4543 __alloc_disk_node+0x289/0x470 block/genhd.c:1275 __blk_mq_alloc_disk+0xe2/0x150 block/blk-mq.c:3140 loop_add+0x2a7/0x880 drivers/block/loop.c:2344 loop_control_ioctl+0x12a/0x730 drivers/block/loop.c:2512 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801da6e000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 328 bytes inside of 1024-byte region [ffff88801da6e000, ffff88801da6e400) The buggy address belongs to the page: page:ffffea0000769a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1da68 head:ffffea0000769a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011041dc0 raw: 0000000000000000 0000000080100010 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 6517, ts 131637535194, free_ts 131637202015 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1900 new_slab mm/slub.c:1963 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:2994 __slab_alloc mm/slub.c:3081 [inline] slab_alloc_node mm/slub.c:3172 [inline] __kmalloc_node_track_caller+0x2d9/0x3e0 mm/slub.c:4936 kmalloc_reserve net/core/skbuff.c:355 [inline] __alloc_skb+0x127/0x580 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1116 [inline] __tcp_send_ack+0x9a/0x620 net/ipv4/tcp_output.c:3946 tcp_rcv_established+0x180d/0x22b0 net/ipv4/tcp_input.c:5895 tcp_v4_do_rcv+0x3a1/0x880 net/ipv4/tcp_ipv4.c:1694 tcp_v4_rcv+0x3aa1/0x4880 net/ipv4/tcp_ipv4.c:2087 ip_protocol_deliver_rcu+0x1ed/0x3b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x316/0x490 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:460 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:551 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:601 [inline] ip_sublist_rcv+0xaab/0xb90 net/ipv4/ip_input.c:609 ip_list_rcv+0x463/0x4b0 net/ipv4/ip_input.c:644 __netif_receive_skb_list_ptype net/core/dev.c:5479 [inline] __netif_receive_skb_list_core+0x73e/0x950 net/core/dev.c:5527 __netif_receive_skb_list+0x4b0/0x590 net/core/dev.c:5579 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3394 skb_release_data+0x2b0/0x4f0 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:755 sk_eat_skb include/net/sock.h:2628 [inline] tcp_recvmsg_locked+0x15ae/0x2c10 net/ipv4/tcp.c:2506 tcp_recvmsg+0x266/0x810 net/ipv4/tcp.c:2552 inet_recvmsg+0x156/0x270 net/ipv4/af_inet.c:852 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x3a7/0x4d0 net/socket.c:1035 call_read_iter include/linux/fs.h:2157 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0xaf9/0xe60 fs/read_write.c:485 ksys_read+0x18f/0x2c0 fs/read_write.c:623 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88801da6e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801da6e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801da6e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801da6e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801da6e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================