RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000cc0 R14: 00000000004cee66 R15: 0000000000000008 ================================================================== BUG: KASAN: use-after-free in dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline] BUG: KASAN: use-after-free in free_cm_id drivers/infiniband/core/iwcm.c:202 [inline] BUG: KASAN: use-after-free in iwcm_deref_id+0x1c4/0x1d0 drivers/infiniband/core/iwcm.c:215 Read of size 8 at addr ffff8880a8cbb578 by task syz-executor.3/24488 CPU: 0 PID: 24488 Comm: syz-executor.3 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:618 dealloc_work_entries drivers/infiniband/core/iwcm.c:162 [inline] free_cm_id drivers/infiniband/core/iwcm.c:202 [inline] iwcm_deref_id+0x1c4/0x1d0 drivers/infiniband/core/iwcm.c:215 destroy_cm_id+0x263/0x520 drivers/infiniband/core/iwcm.c:442 cma_iw_listen drivers/infiniband/core/cma.c:2458 [inline] rdma_listen+0x623/0x910 drivers/infiniband/core/cma.c:3627 cma_listen_on_dev+0x56b/0x6d0 drivers/infiniband/core/cma.c:2506 cma_listen_on_all drivers/infiniband/core/cma.c:2519 [inline] rdma_listen+0x739/0x910 drivers/infiniband/core/cma.c:3635 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1092 ucma_write+0x285/0x350 drivers/infiniband/core/ucma.c:1684 __vfs_write+0x76/0x100 fs/read_write.c:494 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x1e8/0x250 fs/read_write.c:611 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1475f01c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1475f026d4 RCX: 000000000045c849 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000cc0 R14: 00000000004cee66 R15: 0000000000000008 Allocated by task 24488: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:492 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:465 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] alloc_work_entries+0xa3/0x230 drivers/infiniband/core/iwcm.c:172 iw_cm_listen+0x44/0x1e0 drivers/infiniband/core/iwcm.c:571 cma_iw_listen drivers/infiniband/core/cma.c:2455 [inline] rdma_listen+0x5e2/0x910 drivers/infiniband/core/cma.c:3627 cma_listen_on_dev+0x56b/0x6d0 drivers/infiniband/core/cma.c:2506 cma_listen_on_all drivers/infiniband/core/cma.c:2519 [inline] rdma_listen+0x739/0x910 drivers/infiniband/core/cma.c:3635 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1092 ucma_write+0x285/0x350 drivers/infiniband/core/ucma.c:1684 __vfs_write+0x76/0x100 fs/read_write.c:494 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x1e8/0x250 fs/read_write.c:611 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 24488: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:314 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:453 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 dealloc_work_entries drivers/infiniband/core/iwcm.c:163 [inline] alloc_work_entries+0x1d8/0x230 drivers/infiniband/core/iwcm.c:174 iw_cm_listen+0x44/0x1e0 drivers/infiniband/core/iwcm.c:571 cma_iw_listen drivers/infiniband/core/cma.c:2455 [inline] rdma_listen+0x5e2/0x910 drivers/infiniband/core/cma.c:3627 cma_listen_on_dev+0x56b/0x6d0 drivers/infiniband/core/cma.c:2506 cma_listen_on_all drivers/infiniband/core/cma.c:2519 [inline] rdma_listen+0x739/0x910 drivers/infiniband/core/cma.c:3635 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1092 ucma_write+0x285/0x350 drivers/infiniband/core/ucma.c:1684 __vfs_write+0x76/0x100 fs/read_write.c:494 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x1e8/0x250 fs/read_write.c:611 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a8cbb400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 376 bytes inside of 512-byte region [ffff8880a8cbb400, ffff8880a8cbb600) The buggy address belongs to the page: page:ffffea0002a32ec0 refcount:1 mapcount:0 mapping:00000000d2120b18 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00027d6148 ffffea000280a748 ffff8880aa000a80 raw: 0000000000000000 ffff8880a8cbb000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8cbb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8cbb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a8cbb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8cbb580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8cbb600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================