The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 24771179c5c138f0ea3ef88b7972979f62f2d5db Mon Sep 17 00:00:00 2001
From: Christophe JAILLET christophe.jaillet@wanadoo.fr Date: Sun, 27 Aug 2017 11:06:50 +0100 Subject: [PATCH] bus: arm-ccn: Check memory allocation failure
Check memory allocation failures and return -ENOMEM in such cases
This avoids a potential NULL pointer dereference.
Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Acked-by: Scott Branden scott.branden@broadcom.com Cc: stable@vger.kernel.org # 3.17+ Signed-off-by: Pawel Moll pawel.moll@arm.com
diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c index 7625bf762acb..a7951662f85b 100644 --- a/drivers/bus/arm-ccn.c +++ b/drivers/bus/arm-ccn.c @@ -1271,6 +1271,10 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn) int len = snprintf(NULL, 0, "ccn_%d", ccn->dt.id);
name = devm_kzalloc(ccn->dev, len + 1, GFP_KERNEL); + if (!name) { + err = -ENOMEM; + goto error_choose_name; + } snprintf(name, len + 1, "ccn_%d", ccn->dt.id); }
@@ -1319,6 +1323,7 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn)
error_pmu_register: error_set_affinity: +error_choose_name: ida_simple_remove(&arm_ccn_pmu_ida, ccn->dt.id); for (i = 0; i < ccn->num_xps; i++) writel(0, ccn->xp[i].base + CCN_XP_DT_CONTROL);