Merge tag 'vfs-7.1-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Fix error handling in ovl_cache_get()

 - Tighten access checks for exited tasks in pidfd_getfd()

 - Fix selftests leak in __wait_for_test()

 - Limit FUSE_NOTIFY_RETRIEVE to uptodate folios

 - Reject fuse_notify() pagecache ops on directories

 - Clear JOBCTL_PENDING_MASK for caller in zap_other_threads()

 - Fix failure to unlock in nfsd4_create_file()

 - Fix pointer arithmetic in qnx6 directory iteration

 - Fix UAF due to unlocked ->mnt_ns read in may_decode_fh()

 - Avoid potential null folio->mapping deref during iomap error
   reporting

* tag 'vfs-7.1-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  iomap: avoid potential null folio->mapping deref during error reporting
  fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()
  fs/qnx6: fix pointer arithmetic in directory iteration
  VFS: fix possible failure to unlock in nfsd4_create_file()
  signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()
  fuse: reject fuse_notify() pagecache ops on directories
  fuse: limit FUSE_NOTIFY_RETRIEVE to uptodate folios
  selftests: harness: fix pidfd leak in __wait_for_test
  pidfd: refuse access to tasks that have started exiting harder
  ovl: keep err zero after successful ovl_cache_get()

2 files changed, 6 insertions, 3 deletions

diff --git a/kernel/pid.c b/kernel/pid.c
index fd5c2d4aa349..f55189a3d07d 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -885,10 +885,12 @@ static struct file *__pidfd_fget(struct task_struct *task, int fd)
 	if (ret)
 		return ERR_PTR(ret);
 
-	if (ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS))
-		file = fget_task(task, fd);
-	else
+	if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS))
 		file = ERR_PTR(-EPERM);
+	else if (task->flags & PF_EXITING)
+		file = ERR_PTR(-ESRCH);
+	else
+		file = fget_task(task, fd);
 
 	up_read(&task->signal->exec_update_lock);
 
diff --git a/kernel/signal.c b/kernel/signal.c
index 2d102e025883..9c2b32c4d755 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1338,6 +1338,7 @@ int zap_other_threads(struct task_struct *p)
 	int count = 0;
 
 	p->signal->group_stop_count = 0;
+	task_clear_jobctl_pending(p, JOBCTL_PENDING_MASK);
 
 	for_other_threads(p, t) {
 		task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);