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-rw-r--r--include/linux/fdtable.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index a2ec74bc4812..013dc529e95f 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -57,7 +57,14 @@ struct files_struct {
struct file * fd_array[NR_OPEN_DEFAULT];
};
-#define files_fdtable(files) (rcu_dereference((files)->fdt))
+#define rcu_dereference_check_fdtable(files, fdtfd) \
+ (rcu_dereference_check((fdtfd), \
+ rcu_read_lock_held() || \
+ lockdep_is_held(&(files)->file_lock) || \
+ atomic_read(&(files)->count) == 1))
+
+#define files_fdtable(files) \
+ (rcu_dereference_check_fdtable((files), (files)->fdt))
struct file_operations;
struct vfsmount;
@@ -78,7 +85,7 @@ static inline struct file * fcheck_files(struct files_struct *files, unsigned in
struct fdtable *fdt = files_fdtable(files);
if (fd < fdt->max_fds)
- file = rcu_dereference(fdt->fd[fd]);
+ file = rcu_dereference_check_fdtable(files, fdt->fd[fd]);
return file;
}
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