proc: do proper range check on readdir offset

Rather than pass in some random truncated offset to the pid-related
functions, check that the offset is in range up-front.

This is just cleanup, the previous commit fixed the real problem.

Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index dd6628d3ba42e136b4e0f35165798899633332a6..dfa532730e55788a7459095ca9c788dbb58d6af9 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3124,11 +3124,16 @@ static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldi
 /* for the /proc/ directory itself, after non-process stuff has been done */
 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
 {
-       unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
-       struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
+       unsigned int nr;
+       struct task_struct *reaper;
        struct tgid_iter iter;
        struct pid_namespace *ns;
 
+       if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
+               goto out_no_task;
+       nr = filp->f_pos - FIRST_PROCESS_ENTRY;
+
+       reaper = get_proc_task(filp->f_path.dentry->d_inode);
        if (!reaper)
                goto out_no_task;