[PATCH] perf lock contention: Add a missing NULL check

[Namhyung Kim]

I got a report for a failure in BPF verifier on a recent kernel with
perf lock contention command.  It checks task->sighand->siglock without
checking if sighand is NULL or not.  Let's add one.

  ; if (&curr->sighand->siglock == (void *)lock)
  265: (79) r1 = *(u64 *)(r0 +2624)     ; frame1: R0_w=trusted_ptr_task_struct(off=0,imm=0) R1_w=rcu_ptr_or_null_sighand_struct(off=0,imm=0)
  266: (b7) r2 = 0                      ; frame1: R2_w=0
  267: (0f) r1 += r2
  R1 pointer arithmetic on rcu_ptr_or_null_ prohibited, null-check it first
  processed 164 insns (limit 1000000) max_states_per_insn 1 total_states 15 peak_states 15 mark_read 5
  -- END PROG LOAD LOG --
  libbpf: prog 'contention_end': failed to load: -13
  libbpf: failed to load object 'lock_contention_bpf'
  libbpf: failed to load BPF skeleton 'lock_contention_bpf': -13
  Failed to load lock-contention BPF skeleton
  lock contention BPF setup failed
  lock contention did not detect any lock contention

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/bpf_skel/lock_contention.bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/bpf_skel/lock_contention.bpf.c b/tools/perf/util/bpf_skel/lock_contention.bpf.c
index fb54bd38e7d0..4e5914d7eeaa 100644
--- a/tools/perf/util/bpf_skel/lock_contention.bpf.c
+++ b/tools/perf/util/bpf_skel/lock_contention.bpf.c
@@ -305,7 +305,7 @@ static inline __u32 check_lock_type(__u64 lock, __u32 flags)
 		break;
 	case LCB_F_SPIN:  /* spinlock */
 		curr = bpf_get_current_task_btf();
-		if (&curr->sighand->siglock == (void *)lock)
+		if (curr->sighand && &curr->sighand->siglock == (void *)lock)
 			return LCD_F_SIGHAND_LOCK;
 		break;
 	default:
-- 
2.44.0.478.gd926399ef9-goog