From 486fa92df4707b5df58d6508728bdb9321a59766 Mon Sep 17 00:00:00 2001 From: Aditya Pakki Date: Mon, 25 Mar 2019 16:55:27 -0500 Subject: libnvdimm/btt: Fix a kmemdup failure check In case kmemdup fails, the fix releases resources and returns to avoid the NULL pointer dereference. Signed-off-by: Aditya Pakki Signed-off-by: Dan Williams --- drivers/nvdimm/btt_devs.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index b72a303176c7..9486acc08402 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -198,14 +198,15 @@ static struct device *__nd_btt_create(struct nd_region *nd_region, return NULL; nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL); - if (nd_btt->id < 0) { - kfree(nd_btt); - return NULL; - } + if (nd_btt->id < 0) + goto out_nd_btt; nd_btt->lbasize = lbasize; - if (uuid) + if (uuid) { uuid = kmemdup(uuid, 16, GFP_KERNEL); + if (!uuid) + goto out_put_id; + } nd_btt->uuid = uuid; dev = &nd_btt->dev; dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id); @@ -220,6 +221,13 @@ static struct device *__nd_btt_create(struct nd_region *nd_region, return NULL; } return dev; + +out_put_id: + ida_simple_remove(&nd_region->btt_ida, nd_btt->id); + +out_nd_btt: + kfree(nd_btt); + return NULL; } struct device *nd_btt_create(struct nd_region *nd_region) -- cgit v1.2.3-70-g09d2