Hello, I found the following issue using syzkaller on: HEAD commit : e60276b8c11ab4a8be23807bc67b048cfb937dfa (v6.0.8) git tree: stable C Reproducer : https://gist.github.com/oswalpalash/76ca8fcd92332c75a0a7efaa26269c42 Kernel .config : https://gist.github.com/oswalpalash/0962c70d774e5ec736a047bba917cecb Console log : loop0: detected capacity change from 0 to 4096 ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512) ================================================================== BUG: KASAN: use-after-free in run_unpack+0x89a/0x940 Read of size 1 at addr ffff888024b21900 by task syz-executor.0/16961 CPU: 0 PID: 16961 Comm: syz-executor.0 Not tainted 6.0.8-pasta #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 print_report.cold+0xe5/0x63a kasan_report+0x8a/0x1b0 run_unpack+0x89a/0x940 run_unpack_ex+0xb8/0x620 ntfs_iget5+0xc18/0x3270 ntfs_fill_super+0x27de/0x3d30 get_tree_bdev+0x440/0x760 vfs_get_tree+0x89/0x2f0 path_mount+0x121b/0x1cb0 do_mount+0xf3/0x110 __x64_sys_mount+0x18f/0x230 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcf8309146e Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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:00007fcf83dc4a08 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fcf8309146e RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fcf83dc4a60 RBP: 00007fcf83dc4aa0 R08: 00007fcf83dc4aa0 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fcf83dc4a60 R15: 0000000020002a00 </TASK> Allocated by task 6460: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0xa6/0xd0 kmalloc_reserve+0x32/0xd0 __alloc_skb+0x11a/0x320 tcp_stream_alloc_skb+0x38/0x550 tcp_sendmsg_locked+0xc44/0x2fd0 tcp_sendmsg+0x2b/0x40 inet_sendmsg+0x99/0xe0 sock_sendmsg+0xc3/0x120 sock_write_iter+0x291/0x3d0 vfs_write+0x9ca/0xd90 ksys_write+0x1e8/0x250 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 6460: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_set_free_info+0x20/0x30 __kasan_slab_free+0xf5/0x180 kfree+0x15e/0x540 skb_free_head+0xac/0x110 skb_release_data+0x56f/0x850 skb_release_all+0x46/0x60 __kfree_skb+0x11/0x20 tcp_ack+0x1e54/0x5af0 tcp_rcv_established+0x14b5/0x2130 tcp_v4_do_rcv+0x701/0xd00 __release_sock+0x12f/0x3a0 release_sock+0x54/0x1b0 tcp_sendmsg+0x36/0x40 inet_sendmsg+0x99/0xe0 sock_sendmsg+0xc3/0x120 sock_write_iter+0x291/0x3d0 vfs_write+0x9ca/0xd90 ksys_write+0x1e8/0x250 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x7e/0x90 call_rcu+0x99/0x740 xfrm_policy_kill+0x120/0x250 xfrm_policy_delete+0x65/0x90 sk_common_release+0x24e/0x330 inet_release+0x12e/0x270 __sock_release+0xcd/0x280 sock_close+0x18/0x20 __fput+0x27c/0xa90 task_work_run+0xe0/0x1a0 exit_to_user_mode_prepare+0x25d/0x270 syscall_exit_to_user_mode+0x19/0x50 do_syscall_64+0x42/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888024b21800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 256 bytes inside of 1024-byte region [ffff888024b21800, ffff888024b21c00) The buggy address belongs to the physical page: page:ffffea000092c840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24b21 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000a00188 ffffea000077b9c8 ffff888011840700 raw: 0000000000000000 ffff888024b21000 0000000100000002 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 0x2c2220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_THISNODE), pid 16, tgid 16 (ksoftirqd/0), ts 86734280820, free_ts 86664849571 prep_new_page+0x2c6/0x350 get_page_from_freelist+0xae9/0x3a80 __alloc_pages+0x321/0x710 cache_grow_begin+0x75/0x360 kmem_cache_alloc_node_trace+0xbe2/0xd40 __kmalloc_node_track_caller+0x38/0x60 kmalloc_reserve+0x32/0xd0 __alloc_skb+0x11a/0x320 tcp_stream_alloc_skb+0x38/0x550 tcp_write_xmit+0x1c72/0x6170 __tcp_push_pending_frames+0xaa/0x380 tcp_rcv_established+0x9d5/0x2130 tcp_v4_do_rcv+0x701/0xd00 tcp_v4_rcv+0x3cf0/0x3f70 ip_protocol_deliver_rcu+0x9b/0x7c0 ip_local_deliver_finish+0x2fb/0x4e0 page last free stack trace: free_pcp_prepare+0x5ab/0xd00 free_unref_page+0x19/0x410 slab_destroy+0x14/0x50 drain_freelist+0x9c/0xe0 cache_reap+0x1b9/0x2f0 process_one_work+0x9c7/0x1650 worker_thread+0x623/0x1070 kthread+0x2e9/0x3a0 ret_from_fork+0x1f/0x30 Memory state around the buggy address: ffff888024b21800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024b21880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024b21900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024b21980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024b21a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
