[gtk: 1/2] pid_get_parent: fix for OpenBSD

[Matthias Clasen <matthiasc src gnome org>]

commit 0334ea1c889331adb02d361670e24b3f85b5b0d6
Author: Antoine Jacoutot <ajacoutot gnome org>
Date:   Mon May 13 20:47:46 2019 +0200

    pid_get_parent: fix for OpenBSD
    
    This fixes a long standing bug in pid_get_parent on OpenBSD (which was mine
    so... my fault). kp wasn't properly allocated and the function could return
    random failures.

 gtk/gtkmountoperation-x11.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkmountoperation-x11.c b/gtk/gtkmountoperation-x11.c
index 345570c301..1b7bff6aa1 100644
--- a/gtk/gtkmountoperation-x11.c
+++ b/gtk/gtkmountoperation-x11.c
@@ -736,7 +736,7 @@ pid_get_command_line (GPid pid)
 static GPid
 pid_get_parent (GPid pid)
 {
-  struct kinfo_proc kp;
+  struct kinfo_proc *kp;
   size_t len;
   GPid ppid;
 
@@ -747,11 +747,14 @@ pid_get_parent (GPid pid)
       return (-1);
   mib[5] = (len / sizeof(struct kinfo_proc));
 
-  if (sysctl (mib, G_N_ELEMENTS (mib), &kp, &len, NULL, 0) < 0)
+  kp = g_malloc0 (len);
+
+  if (sysctl (mib, G_N_ELEMENTS (mib), kp, &len, NULL, 0) < 0)
       return -1;
 
-  ppid = kp.p_ppid;
+  ppid = kp->p_ppid;
 
+  g_free (kp);
   return ppid;
 }