squashfs: fix warn_on when root inode is corrupted

[safe/jmp/linux-2.6] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 58324c2..7621db8 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -81,6 +81,7 @@
 #include <linux/elf.h>
 #include <linux/pid_namespace.h>
 #include <linux/fs_struct.h>
+#include <linux/slab.h>
 #include "internal.h"
 
 /* NOTE:
@@ -442,12 +443,13 @@ static const struct file_operations proc_lstats_operations = {
 unsigned long badness(struct task_struct *p, unsigned long uptime);
 static int proc_oom_score(struct task_struct *task, char *buffer)
 {
-       unsigned long points;
+       unsigned long points = 0;
        struct timespec uptime;
 
        do_posix_clock_monotonic_gettime(&uptime);
        read_lock(&tasklist_lock);
-       points = badness(task->group_leader, uptime.tv_sec);
+       if (pid_alive(task))
+               points = badness(task, uptime.tv_sec);
        read_unlock(&tasklist_lock);
        return sprintf(buffer, "%lu\n", points);
 }
@@ -647,17 +649,11 @@ static int mounts_release(struct inode *inode, struct file *file)
 static unsigned mounts_poll(struct file *file, poll_table *wait)
 {
        struct proc_mounts *p = file->private_data;
-       struct mnt_namespace *ns = p->ns;
        unsigned res = POLLIN | POLLRDNORM;
 
-       poll_wait(file, &ns->poll, wait);
-
-       spin_lock(&vfsmount_lock);
-       if (p->event != ns->event) {
-               p->event = ns->event;
+       poll_wait(file, &p->ns->poll, wait);
+       if (mnt_had_events(p))
                res |= POLLERR | POLLPRI;
-       }
-       spin_unlock(&vfsmount_lock);
 
        return res;
 }
@@ -1095,8 +1091,12 @@ 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;