b43legacy: fix debugfs crash

This patch fixes a crash that happens because b43legacy's
debugfs code expects file->f_op to be a pointer to its own
b43legacy_debugfs_fops struct. This is no longer the case
since commit 9fd4dcece43a
("debugfs: prevent access to possibly dead file_operations at file open")

Reviewed-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Cc: stable <stable@vger.kernel.org> # 4.7+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/wireless/broadcom/b43legacy/debugfs.c b/drivers/net/wireless/broadcom/b43legacy/debugfs.c
index 090910ea259e..82ef56ed7ca1 100644
--- a/drivers/net/wireless/broadcom/b43legacy/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/debugfs.c
@@ -221,7 +221,8 @@ static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf,
                 goto out_unlock;
         }
 
-        dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+        dfops = container_of(debugfs_real_fops(file),
+                             struct b43legacy_debugfs_fops, fops);
         if (!dfops->read) {
                 err = -ENOSYS;
                 goto out_unlock;
@@ -287,7 +288,8 @@ static ssize_t b43legacy_debugfs_write(struct file *file,
                 goto out_unlock;
         }
 
-        dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+        dfops = container_of(debugfs_real_fops(file),
+                             struct b43legacy_debugfs_fops, fops);
         if (!dfops->write) {
                 err = -ENOSYS;
                 goto out_unlock;