CVE-2026-31629

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

nfc: llcp: add missing return after LLCP_CLOSED checks

In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket

state is LLCP_CLOSED, the code correctly calls release_sock() and

nfc_llcp_sock_put() but fails to return. Execution falls through to

the remainder of the function, which calls release_sock() and

nfc_llcp_sock_put() again. This results in a double release_sock()

and a refcount underflow via double nfc_llcp_sock_put(), leading to

a use-after-free.

Add the missing return statements after the LLCP_CLOSED branches

in both functions to prevent the fall-through.