4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Christian Lamparter <[email protected]> commit 9c4a45b17e094a090e96beb1138e34c2a10c6b8c upstream. 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 <[email protected]> Signed-off-by: Christian Lamparter <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/net/wireless/broadcom/b43legacy/debugfs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- 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(st 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(s 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;
