================================================================== BUG: KASAN: use-after-free in cma_alloc_any_port drivers/infiniband/core/cma.c:3319 [inline] BUG: KASAN: use-after-free in cma_get_port drivers/infiniband/core/cma.c:3471 [inline] BUG: KASAN: use-after-free in rdma_bind_addr+0x1dfa/0x1f80 drivers/infiniband/core/cma.c:3591 Read of size 8 at addr ffff8880a7c27a48 by task syz-executor.5/8955 CPU: 0 PID: 8955 Comm: syz-executor.5 Not tainted 5.1.0-rc3-next-20190403 #17 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_alloc_any_port drivers/infiniband/core/cma.c:3319 [inline] cma_get_port drivers/infiniband/core/cma.c:3471 [inline] rdma_bind_addr+0x1dfa/0x1f80 drivers/infiniband/core/cma.c:3591 cma_bind_addr drivers/infiniband/core/cma.c:3121 [inline] rdma_resolve_addr+0x437/0x21f0 drivers/infiniband/core/cma.c:3132 rdma_create_trans+0xaec/0x1390 net/9p/trans_rdma.c:685 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: 0033:0x4582b9 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:00007f246d5d7c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004582b9 RDX: 0000000020000600 RSI: 00000000200005c0 RDI: 00000000200003c0 RBP: 000000000073bfa0 R08: 0000000020000a00 R09: 0000000000000000 R10: 000000000000c004 R11: 0000000000000246 R12: 00007f246d5d86d4 R13: 00000000004c4056 R14: 00000000004d7688 R15: 00000000ffffffff Allocated by task 8615: 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_alloc_any_port drivers/infiniband/core/cma.c:3317 [inline] cma_get_port drivers/infiniband/core/cma.c:3471 [inline] rdma_bind_addr+0x1658/0x1f80 drivers/infiniband/core/cma.c:3591 cma_bind_addr drivers/infiniband/core/cma.c:3121 [inline] rdma_resolve_addr+0x437/0x21f0 drivers/infiniband/core/cma.c:3132 rdma_create_trans+0xaec/0x1390 net/9p/trans_rdma.c:685 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 8615: 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 ffff8880a7c27a40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8880a7c27a40, ffff8880a7c27a60) The buggy address belongs to the page: page:ffffea00029f09c0 count:1 mapcount:0 mapping:ffff88812c3f01c0 index:0xffff8880a7c27fc1 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002739c48 ffffea000273b708 ffff88812c3f01c0 raw: ffff8880a7c27fc1 ffff8880a7c27000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7c27900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a7c27980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880a7c27a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880a7c27a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a7c27b00: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc ==================================================================