From b2bc4782191cb574924a1d09f48083ea8b33a93b Mon Sep 17 00:00:00 2001 From: Goldwyn Rodrigues Date: Mon, 4 Jul 2011 09:26:57 -0700 Subject: [PATCH] RDMA: Check for NULL mode in .devnode methods 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 Signed-off-by: Linus Torvalds --- 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 f62f52fb9ece..fc0f2bd9ca82 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 e49a85f8a44d..56898b6578a4 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)); } -- 2.34.1