================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff88809cfa01d8 by task syz-executor.1/18059 CPU: 1 PID: 18059 Comm: syz-executor.1 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __list_add_valid+0x93/0xa0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2327 [inline] rdma_listen+0x656/0x9b0 drivers/infiniband/core/cma.c:3339 ucma_listen+0x10b/0x170 drivers/infiniband/core/ucma.c:1078 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f8480f8e0d9 RSP: 002b:00007f847f500168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f84810adf80 RCX: 00007f8480f8e0d9 RDX: 0000000000000010 RSI: 0000000020000380 RDI: 0000000000000003 RBP: 00007f8480fe9ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4a54466f R14: 00007f847f500300 R15: 0000000000022000 Allocated by task 17947: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] rdma_create_id+0x57/0x4c0 drivers/infiniband/core/cma.c:790 ucma_create_id+0x18b/0x500 drivers/infiniband/core/ucma.c:484 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 Freed by task 17947: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 The buggy address belongs to the object at ffff88809cfa0000 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff88809cfa0000, ffff88809cfa0400) The buggy address belongs to the page: page:ffffea000273e800 count:1 mapcount:0 mapping:ffff88809cfa0000 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff88809cfa0000 0000000000000000 0000000100000007 raw: ffffea00024c85a0 ffffea0002ad2f20 ffff88813fe74ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809cfa0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809cfa0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809cfa0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809cfa0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809cfa0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================