From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758304Ab1GDQ1F (ORCPT ); Mon, 4 Jul 2011 12:27:05 -0400 Received: from na3sys010aog110.obsmtp.com ([74.125.245.88]:52430 "HELO na3sys010aog110.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1758293Ab1GDQ1D (ORCPT ); Mon, 4 Jul 2011 12:27:03 -0400 From: Roland Dreier To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Subject: RDMA: Check for NULL mode in .devnode methods Date: Mon, 4 Jul 2011 09:26:57 -0700 Message-Id: <1309796817-25293-1-git-send-email-roland@kernel.org> X-Mailer: git-send-email 1.7.5.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Goldwyn Rodrigues Commits 71c29bd5c235 ("IB/uverbs: Add devnode method to set path/mode") and c3af0980ce01 ("IB: Add devnode methods to cm_class and umad_class") added devnode methods that set the mode. However, these methods don't check for a NULL mode, and so we get a crash when unloading modules because devtmpfs_delete_node() calls device_get_devnode() with mode == NULL. Add the missing checks. Signed-off-by: Goldwyn Rodrigues [ Also fix cm.c. - Roland ] Signed-off-by: Roland Dreier --- Linus, please apply -- this fixes a regression introduced in 3.0-rc1. drivers/infiniband/core/cm.c | 3 ++- drivers/infiniband/core/uverbs_main.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index f62f52f..fc0f2bd 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -3641,7 +3641,8 @@ static struct kobj_type cm_port_obj_type = { static char *cm_devnode(struct device *dev, mode_t *mode) { - *mode = 0666; + if (mode) + *mode = 0666; return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); } diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c index e49a85f..56898b6 100644 --- a/drivers/infiniband/core/uverbs_main.c +++ b/drivers/infiniband/core/uverbs_main.c @@ -826,7 +826,8 @@ static void ib_uverbs_remove_one(struct ib_device *device) static char *uverbs_devnode(struct device *dev, mode_t *mode) { - *mode = 0666; + if (mode) + *mode = 0666; return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); }