Linux vulnerability

What happened

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 versions

Linux: 4fb8518bdac8e85f6580ea3f586adf396cd472bc through before e68380710fc970e07610b2f42594575ad35fdb1c (git); 4fb8518bdac8e85f6580ea3f586adf396cd472bc through before ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6 (git); 4fb8518bdac8e85f6580ea3f586adf396cd472bc through before e346ef7bcb137f50c49f969330ab7dcf64ea1654 (git); 2.6.37 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.