RDMA/core: Fix use-after-free when rename device name

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

RDMA/core: Fix use-after-free when rename device name

Syzbot reported a slab-use-after-free with the following call trace:

==================================================================

BUG: KASAN: slab-use-after-free in nla_put+0xd3/0x150 lib/nlattr.c:1099

Read of size 5 at addr ffff888140ea1c60 by task syz.0.988/10025

CPU: 0 UID: 0 PID: 10025 Comm: syz.0.988

Not tainted 6.14.0-rc4-syzkaller-00859-gf77f12010f67 #0

Hardware name: Google Compute Engine, BIOS Google 02/12/2025

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120

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

print_report+0x16e/0x5b0 mm/kasan/report.c:521

kasan_report+0x143/0x180 mm/kasan/report.c:634

kasan_check_range+0x282/0x290 mm/kasan/generic.c:189

__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105

nla_put+0xd3/0x150 lib/nlattr.c:1099

nla_put_string include/net/netlink.h:1621 [inline]

fill_nldev_handle+0x16e/0x200 drivers/infiniband/core/nldev.c:265

rdma_nl_notify_event+0x561/0xef0 drivers/infiniband/core/nldev.c:2857

ib_device_notify_register+0x22/0x230 drivers/infiniband/core/device.c:1344

ib_register_device+0x1292/0x1460 drivers/infiniband/core/device.c:1460

rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540

rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550

rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212

nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795

rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]

rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259

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

netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339

netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883

sock_sendmsg_nosec net/socket.c:709 [inline]

__sock_sendmsg+0x221/0x270 net/socket.c:724

____sys_sendmsg+0x53a/0x860 net/socket.c:2564

___sys_sendmsg net/socket.c:2618 [inline]

__sys_sendmsg+0x269/0x350 net/socket.c:2650

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

RIP: 0033:0x7f42d1b8d169

Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 ...

RSP: 002b:00007f42d2960038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e

RAX: ffffffffffffffda RBX: 00007f42d1da6320 RCX: 00007f42d1b8d169

RDX: 0000000000000000 RSI: 00004000000002c0 RDI: 000000000000000c

RBP: 00007f42d1c0e2a0 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000000000 R14: 00007f42d1da6320 R15: 00007ffe399344a8

</TASK>

Allocated by task 10025:

kasan_save_stack mm/kasan/common.c:47 [inline]

kasan_save_track+0x3f/0x80 mm/kasan/common.c:68

poison_kmalloc_redzone mm/kasan/common.c:377 [inline]

__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394

kasan_kmalloc include/linux/kasan.h:260 [inline]

__do_kmalloc_node mm/slub.c:4294 [inline]

__kmalloc_node_track_caller_noprof+0x28b/0x4c0 mm/slub.c:4313

__kmemdup_nul mm/util.c:61 [inline]

kstrdup+0x42/0x100 mm/util.c:81

kobject_set_name_vargs+0x61/0x120 lib/kobject.c:274

dev_set_name+0xd5/0x120 drivers/base/core.c:3468

assign_name drivers/infiniband/core/device.c:1202 [inline]

ib_register_device+0x178/0x1460 drivers/infiniband/core/device.c:1384

rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540

rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550

rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212

nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795

rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]

rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259

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

netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339

netlink_sendmsg+0x8de/0xcb0 net

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