3 files changed, 31 insertions, 8 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 13b5d0708175..18e20feee251 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -270,7 +270,9 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
                 blocked = p->blocked;
                 collect_sigign_sigcatch(p, &ignored, &caught);
                 num_threads = atomic_read(&p->signal->count);
+                rcu_read_lock();  /* FIXME: is this correct? */
                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
+                rcu_read_unlock();
                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
                 unlock_task_sighand(p, &flags);
         }
diff --git a/fs/proc/base.c b/fs/proc/base.c
index e42bbd843ed1..623e2ffb5d2b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1095,8 +1095,12 @@ static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
         if (!capable(CAP_AUDIT_CONTROL))
                 return -EPERM;
 
-        if (current != pid_task(proc_pid(inode), PIDTYPE_PID))
+        rcu_read_lock();
+        if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
+                rcu_read_unlock();
                 return -EPERM;
+        }
+        rcu_read_unlock();
 
         if (count >= PAGE_SIZE)
                 count = PAGE_SIZE - 1;
@@ -2369,16 +2373,30 @@ static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
         struct pid_namespace *ns = dentry->d_sb->s_fs_info;
         pid_t tgid = task_tgid_nr_ns(current, ns);
-        char tmp[PROC_NUMBUF];
-        if (!tgid)
-                return ERR_PTR(-ENOENT);
-        sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
-        return ERR_PTR(vfs_follow_link(nd,tmp));
+        char *name = ERR_PTR(-ENOENT);
+        if (tgid) {
+                name = __getname();
+                if (!name)
+                        name = ERR_PTR(-ENOMEM);
+                else
+                        sprintf(name, "%d", tgid);
+        }
+        nd_set_link(nd, name);
+        return NULL;
+}
+
+static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
+                                void *cookie)
+{
+        char *s = nd_get_link(nd);
+        if (!IS_ERR(s))
+                __putname(s);
 }
 
 static const struct inode_operations proc_self_inode_operations = {
         .readlink       = proc_self_readlink,
         .follow_link    = proc_self_follow_link,
+        .put_link       = proc_self_put_link,
 };
 
 /*
diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
index 123257bb356b..f8650dce74fb 100644
--- a/fs/proc/proc_devtree.c
+++ b/fs/proc/proc_devtree.c
@@ -10,16 +10,19 @@
 #include <linux/seq_file.h>
 #include <linux/stat.h>
 #include <linux/string.h>
+#include <linux/of.h>
+#include <linux/module.h>
 #include <asm/prom.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
-#ifndef HAVE_ARCH_DEVTREE_FIXUPS
 static inline void set_node_proc_entry(struct device_node *np,
                                        struct proc_dir_entry *de)
 {
-}
+#ifdef HAVE_ARCH_DEVTREE_FIXUPS
+        np->pde = de;
 #endif
+}
 
 static struct proc_dir_entry *proc_device_tree;