CVE-2021-47078

In the Linux kernel, the following vulnerability has been resolved:
RDMA/rxe: Clear all QP fields if creation failed rxe_qp_do_cleanup() relies
on valid pointer values in QP for the properly created ones, but in case
rxe_qp_from_init() failed it was filled with garbage and caused tot the
following error. refcount_t: underflow; use-after-free. WARNING: CPU: 1
PID: 12560 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0
lib/refcount.c:28 Modules linked in: CPU: 1 PID: 12560 Comm: syz-executor.4
Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute
Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP:
0010:refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28 Code: e9 db fe ff
ff 48 89 df e8 2c c2 ea fd e9 8a fe ff ff e8 72 6a a7 fd 48 c7 c7 e0 b2 c1
89 c6 05 dc 3a e6 09 01 e8 ee 74 fb 04 <0f> 0b e9 af fe ff ff 0f 1f 84 00
00 00 00 00 41 56 41 55 41 54 55 RSP: 0018:ffffc900097ceba8 EFLAGS:
00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815bb075 RDI: fffff520012f9d67 RBP:
0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10:
ffffffff815b4eae R11: 0000000000000000 R12: ffff8880322a4800 R13:
ffff8880322a4940 R14: ffff888033044e00 R15: 0000000000000000 FS:
00007f6eb2be3700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS:
0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdbe5d41000 CR3:
000000001d181000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_sub_and_test
include/linux/refcount.h:283 [inline] __refcount_dec_and_test
include/linux/refcount.h:315 [inline] refcount_dec_and_test
include/linux/refcount.h:333 [inline] kref_put include/linux/kref.h:64
[inline] rxe_qp_do_cleanup+0x96f/0xaf0
drivers/infiniband/sw/rxe/rxe_qp.c:805
execute_in_process_context+0x37/0x150 kernel/workqueue.c:3327
rxe_elem_release+0x9f/0x180 drivers/infiniband/sw/rxe/rxe_pool.c:391
kref_put include/linux/kref.h:65 [inline] rxe_create_qp+0x2cd/0x310
drivers/infiniband/sw/rxe/rxe_verbs.c:425 _ib_create_qp
drivers/infiniband/core/core_priv.h:331 [inline]
ib_create_named_qp+0x2ad/0x1370 drivers/infiniband/core/verbs.c:1231
ib_create_qp include/rdma/ib_verbs.h:3644 [inline]
create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2920
ib_mad_port_open drivers/infiniband/core/mad.c:3001 [inline]
ib_mad_init_device+0xd6f/0x1400 drivers/infiniband/core/mad.c:3092
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:717
enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
ib_register_device drivers/infiniband/core/device.c:1413 [inline]
ib_register_device+0x7c7/0xa50 drivers/infiniband/core/device.c:1365
rxe_register_device+0x3d5/0x4a0 drivers/infiniband/sw/rxe/rxe_verbs.c:1147
rxe_add+0x12fe/0x16d0 drivers/infiniband/sw/rxe/rxe.c:247
rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:503 rxe_newlink
drivers/infiniband/sw/rxe/rxe.c:269 [inline] rxe_newlink+0xb7/0xe0
drivers/infiniband/sw/rxe/rxe.c:250 nldev_newlink+0x30e/0x550
drivers/infiniband/core/nldev.c:1555 rdma_nl_rcv_msg+0x36d/0x690
drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb
drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x2ee/0x430
drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel
net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0
net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90
net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810
net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x3a/0xb0
arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0 —truncated—