================================================================== BUG: KASAN: use-after-free in kernel_accept+0x2a4/0x310 net/socket.c:3247 Read of size 8 at addr ffff8801c9e579e8 by task kworker/0:3/6035 CPU: 0 PID: 6035 Comm: kworker/0:3 Not tainted 4.19.0-rc6+ #248 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events smc_tcp_listen_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 kernel_accept+0x2a4/0x310 net/socket.c:3247 smc_clcsock_accept net/smc/af_smc.c:834 [inline] smc_tcp_listen_work+0x218/0x11c0 net/smc/af_smc.c:1302 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Allocated by task 14831: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 sock_alloc_inode+0x1d/0x260 net/socket.c:244 alloc_inode+0x63/0x190 fs/inode.c:210 new_inode_pseudo+0x71/0x1a0 fs/inode.c:903 sock_alloc+0x41/0x270 net/socket.c:547 __sock_create+0x175/0x930 net/socket.c:1241 sock_create_kern+0x3b/0x50 net/socket.c:1323 smc_create+0x17c/0x3b0 net/smc/af_smc.c:1907 __sock_create+0x536/0x930 net/socket.c:1277 sock_create net/socket.c:1317 [inline] __sys_socket+0x106/0x260 net/socket.c:1347 __do_sys_socket net/socket.c:1356 [inline] __se_sys_socket net/socket.c:1354 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1354 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14827: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3756 sock_destroy_inode+0x51/0x60 net/socket.c:272 destroy_inode+0x159/0x200 fs/inode.c:267 evict+0x5e0/0x980 fs/inode.c:575 iput_final fs/inode.c:1547 [inline] iput+0x679/0xa90 fs/inode.c:1573 __sock_release+0x1ec/0x250 net/socket.c:590 sock_release+0x17/0x20 net/socket.c:598 smc_release+0x1a8/0x730 net/smc/af_smc.c:148 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801c9e579c0 which belongs to the cache sock_inode_cache(97:syz5) of size 984 The buggy address is located 40 bytes inside of 984-byte region [ffff8801c9e579c0, ffff8801c9e57d98) The buggy address belongs to the page: page:ffffea00072795c0 count:1 mapcount:0 mapping:ffff8801ba762940 index:0xffff8801c9e57ffd flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007275cc8 ffffea0007122388 ffff8801ba762940 raw: ffff8801c9e57ffd ffff8801c9e570c0 0000000100000003 ffff88019a2a8200 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88019a2a8200 Memory state around the buggy address: ffff8801c9e57880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c9e57900: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801c9e57980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801c9e57a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c9e57a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================