CVE-2026-89527svcrdma: Use svc_xprt_put to free listener on create failure

Official description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Use svc_xprt_put to free listener on create failure svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/31b8293495ba94ccf494e556a318886b716884b6
• https://git.kernel.org/stable/c/2e35ec558b8cece9399a50141ecaeadbdb8768dc
• https://git.kernel.org/stable/c/ee70d690b5544b736706a9a5796aafb634013f54
• https://git.kernel.org/stable/c/e68380710fc970e07610b2f42594575ad35fdb1c
• https://git.kernel.org/stable/c/ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6
• https://git.kernel.org/stable/c/e346ef7bcb137f50c49f969330ab7dcf64ea1654