Riskcovery

CVE-2021-47392

RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure

State
Published
Severity
Not scored
Published
May 21, 2024
Updated
May 23, 2026
Reserved
May 21, 2024

Read the record on cve.org

Description

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

RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure

If cma_listen_on_all() fails it leaves the per-device ID still on the listen_list but the state is not set to RDMA_CM_ADDR_BOUND.

When the cmid is eventually destroyed cma_cancel_listens() is not called due to the wrong state, however the per-device IDs are still holding the refcount preventing the ID from being destroyed, thus deadlocking:

task:rping state:D stack: 0 pid:19605 ppid: 47036 flags:0x00000084 Call Trace: __schedule+0x29a/0x780 ? free_unref_page_commit+0x9b/0x110 schedule+0x3c/0xa0 schedule_timeout+0x215/0x2b0 ? __flush_work+0x19e/0x1e0 wait_for_completion+0x8d/0xf0 _destroy_id+0x144/0x210 [rdma_cm] ucma_close_id+0x2b/0x40 [rdma_ucm] __destroy_id+0x93/0x2c0 [rdma_ucm] ? __xa_erase+0x4a/0xa0 ucma_destroy_id+0x9a/0x120 [rdma_ucm] ucma_write+0xb8/0x130 [rdma_ucm] vfs_write+0xb4/0x250 ksys_write+0xb5/0xd0 ? syscall_trace_enter.isra.19+0x123/0x190 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Ensure that cma_listen_on_all() atomically unwinds its action under the lock during error.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 70ba8b1697e35c04ea5f22edb6e401aeb1208d96 to before 3f4e68902d2e545033c80d7ad62fd9a439e573f4Affected
  • c80a0c52d85c49a910d0dc0e342e8d8898677dc0 to before e56a5146ef8cb51cd7c9e748267dce7564448a35Affected
  • c80a0c52d85c49a910d0dc0e342e8d8898677dc0 to before ca465e1f1f9b38fe916a36f7d80c5d25f2337c81Affected
  • 5.10.4 to before 5.10.71Affected
LinuxLinux
  • 5.11Affected
  • before 5.11Not affected
  • 5.10.71 through 5.10.*Not affected
  • 5.14.10 through 5.14.*Not affected
  • 5.15 and laterNot affected

References

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