Bug 2420356 (CVE-2022-50671)

Summary: CVE-2022-50671 kernel: RDMA/rxe: Fix "kernel NULL pointer dereference" error
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A NULL pointer dereference vulnerability was found in the RXE (Soft-RoCE) RDMA driver in the Linux kernel. When rxe_queue_init() fails during queue pair initialization in rxe_qp_init_req(), the task function and argument pointers (qp->req.task.func and qp->req.task.arg) remain uninitialized. The cleanup function rxe_qp_do_cleanup() then attempts to use these uninitialized pointers when calling __rxe_do_task(), causing a kernel NULL pointer dereference.
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Description OSIDB Bzimport 2025-12-09 02:05:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix "kernel NULL pointer dereference" error

When rxe_queue_init in the function rxe_qp_init_req fails,
both qp->req.task.func and qp->req.task.arg are not initialized.

Because of creation of qp fails, the function rxe_create_qp will
call rxe_qp_do_cleanup to handle allocated resource.

Before calling __rxe_do_task, both qp->req.task.func and
qp->req.task.arg should be checked.
Comment 1 Alexander B 2025-12-09 17:30:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120946-CVE-2022-50671-e025@gregkh/T