RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem

Call Trace:

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:408 [inline]

print_report+0xc3/0x670 mm/kasan/report.c:521

kasan_report+0xe0/0x110 mm/kasan/report.c:634

strlen+0x93/0xa0 lib/string.c:420

__fortify_strlen include/linux/fortify-string.h:268 [inline]

get_kobj_path_length lib/kobject.c:118 [inline]

kobject_get_path+0x3f/0x2a0 lib/kobject.c:158

kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545

ib_register_device drivers/infiniband/core/device.c:1472 [inline]

ib_register_device+0x8cf/0xe00 drivers/infiniband/core/device.c:1393

rxe_register_device+0x275/0x320 drivers/infiniband/sw/rxe/rxe_verbs.c:1552

rxe_net_add+0x8e/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:550

rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:225

nldev_newlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796

rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195

rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450

netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]

netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339

netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883

sock_sendmsg_nosec net/socket.c:712 [inline]

__sock_sendmsg net/socket.c:727 [inline]

____sys_sendmsg+0xa95/0xc70 net/socket.c:2566

___sys_sendmsg+0x134/0x1d0 net/socket.c:2620

__sys_sendmsg+0x16d/0x220 net/socket.c:2652

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

This problem is similar to the problem that the

commit 1d6a9e7449e2 ("RDMA/core: Fix use-after-free when rename device name")

fixes.

The root cause is: the function ib_device_rename() renames the name with

lock. But in the function kobject_uevent(), this name is accessed without

lock protection at the same time.

The solution is to add the lock protection when this name is accessed in

the function kobject_uevent().