Do not segfault when procstat -f or procstat -v is called on a process not

owned by the current user.  If kinfo_getfile() or kinfo_getvmmap() return
NULL, simply exit, and do not try and derefernce the memory.

Reviewed by:	peter
Approved by:	peter

1 files changed, 2 insertions, 0 deletions

diff --git a/usr.bin/procstat/procstat_files.c b/usr.bin/procstat/procstat_files.c
index 1f620f3..74ec590 100644
--- a/usr.bin/procstat/procstat_files.c
+++ b/usr.bin/procstat/procstat_files.c
@@ -144,6 +144,8 @@ procstat_files(pid_t pid, struct kinfo_proc *kipp)
 		    "PRO", "NAME");
 
 	freep = kinfo_getfile(pid, &cnt);
+	if (freep == NULL)
+		return;
 	for (i = 0; i < cnt; i++) {
 		kif = &freep[i];