================================================================== BUG: KASAN: use-after-free in cma_check_port+0x8ce/0x8f0 drivers/infiniband/core/cma.c:3354 Read of size 8 at addr ffff88808e370a48 by task syz-executor.5/11201 CPU: 0 PID: 11201 Comm: syz-executor.5 Not tainted 5.1.0-rc3-next-20190402 #16 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 cma_check_port+0x8ce/0x8f0 drivers/infiniband/core/cma.c:3354 cma_use_port drivers/infiniband/core/cma.c:3391 [inline] cma_get_port drivers/infiniband/core/cma.c:3473 [inline] rdma_bind_addr+0x19c3/0x1f80 drivers/infiniband/core/cma.c:3591 p9_rdma_bind_privport net/9p/trans_rdma.c:627 [inline] rdma_create_trans+0x9ad/0x1390 net/9p/trans_rdma.c:673 p9_client_create+0x89c/0x1400 net/9p/client.c:1053 v9fs_session_init+0x1e7/0x1960 fs/9p/v9fs.c:421 v9fs_mount+0x7d/0x920 fs/9p/vfs_super.c:135 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584 vfs_get_tree+0x123/0x450 fs/super.c:1481 do_new_mount fs/namespace.c:2622 [inline] do_mount+0x1436/0x2c40 fs/namespace.c:2942 ksys_mount+0xdb/0x150 fs/namespace.c:3151 __do_sys_mount fs/namespace.c:3165 [inline] __se_sys_mount fs/namespace.c:3162 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3162 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007efc92263c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458209 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000000 RBP: 000000000073bf00 R08: 0000000020000340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efc922646d4 R13: 00000000004c3fb6 R14: 00000000004d75e8 R15: 00000000ffffffff Allocated by task 11190: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3622 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] cma_alloc_port+0x4f/0x1a0 drivers/infiniband/core/cma.c:3241 cma_use_port drivers/infiniband/core/cma.c:3389 [inline] cma_get_port drivers/infiniband/core/cma.c:3473 [inline] rdma_bind_addr+0x1bc0/0x1f80 drivers/infiniband/core/cma.c:3591 p9_rdma_bind_privport net/9p/trans_rdma.c:627 [inline] rdma_create_trans+0x9ad/0x1390 net/9p/trans_rdma.c:673 p9_client_create+0x89c/0x1400 net/9p/client.c:1053 v9fs_session_init+0x1e7/0x1960 fs/9p/v9fs.c:421 v9fs_mount+0x7d/0x920 fs/9p/vfs_super.c:135 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584 vfs_get_tree+0x123/0x450 fs/super.c:1481 do_new_mount fs/namespace.c:2622 [inline] do_mount+0x1436/0x2c40 fs/namespace.c:2942 ksys_mount+0xdb/0x150 fs/namespace.c:3151 __do_sys_mount fs/namespace.c:3165 [inline] __se_sys_mount fs/namespace.c:3162 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3162 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11190: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3499 [inline] kfree+0xcf/0x230 mm/slab.c:3822 cma_release_port drivers/infiniband/core/cma.c:1773 [inline] rdma_destroy_id+0x7fc/0xaa0 drivers/infiniband/core/cma.c:1840 rdma_destroy_trans+0x179/0x1c0 net/9p/trans_rdma.c:392 rdma_create_trans+0xffc/0x1390 net/9p/trans_rdma.c:749 p9_client_create+0x89c/0x1400 net/9p/client.c:1053 v9fs_session_init+0x1e7/0x1960 fs/9p/v9fs.c:421 v9fs_mount+0x7d/0x920 fs/9p/vfs_super.c:135 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584 vfs_get_tree+0x123/0x450 fs/super.c:1481 do_new_mount fs/namespace.c:2622 [inline] do_mount+0x1436/0x2c40 fs/namespace.c:2942 ksys_mount+0xdb/0x150 fs/namespace.c:3151 __do_sys_mount fs/namespace.c:3165 [inline] __se_sys_mount fs/namespace.c:3162 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3162 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808e370a40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff88808e370a40, ffff88808e370a60) The buggy address belongs to the page: page:ffffea000238dc00 count:1 mapcount:0 mapping:ffff88812c3f01c0 index:0xffff88808e370fc1 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000265ed48 ffffea0002810048 ffff88812c3f01c0 raw: ffff88808e370fc1 ffff88808e370000 000000010000002a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808e370900: fb fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc ffff88808e370980: fb fb fb fb fc fc fc fc 00 00 00 01 fc fc fc fc >ffff88808e370a00: 00 01 fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88808e370a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88808e370b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================