CVE-2021-47078

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