misc: fastrpc: possible double-free of cctx->remote_heap

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

misc: fastrpc: possible double-free of cctx->remote_heap

fastrpc_init_create_static_process() may free cctx->remote_heap on the

err_map path but does not clear the pointer. Later, fastrpc_rpmsg_remove()

frees cctx->remote_heap again if it is non-NULL, which can lead to a

double-free if the INIT_CREATE_STATIC ioctl hits the error path and the rpmsg

device is subsequently removed/unbound.

Clear cctx->remote_heap after freeing it in the error path to prevent the

later cleanup from freeing it again.

This issue was found by an in-house analysis workflow that extracts AST-based

information and runs static checks, with LLM assistance for triage, and was

confirmed by manual code review.

No hardware testing was performed.