[BUG] staging: lustre: Possible null function pointer in ctx_refresh_timeout()

[Jia-Ju Bai]

In Linux-4.16, drivers/staging/lustre/lustre/ptlrp/sec.c,

557. int ctx_refresh_timeout(...) {
ÂÂÂÂÂÂÂÂÂÂÂ .......
573. req->rq_cli_ctx->cc_ops->force_die(req->rq_cli_ctx, 0);
ÂÂÂÂÂÂÂÂÂÂÂ ......
575. }

For x86 kernel configuration, there is no assignment of the function 
pointer ".force_die" in the kernel code.
So calling the function pointer in line 573 may cause a null pointer 
dereference.


Best wishes,
Jia-Ju Bai