From: Sibi Sankar <sibis@codeaurora.org>
Date: Tue, 3 Apr 2018 18:15:15 +0000 (+0530)
Subject: remoteproc: fix null pointer dereference on glink only platforms
X-Git-Tag: v4.17-rc1~56^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=730b2ad8f72898029160a6832141ba954122a0c8;p=linux.git

remoteproc: fix null pointer dereference on glink only platforms

Currently calling list_del on smd subdev remove path results in
null pointer dereference on glink only platforms. Fix this by
adding safety checks in glink/smd subdev remove paths.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 9e47a147c131..acfc99f82fb8 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -75,6 +75,9 @@ EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
  */
 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
 {
+	if (!glink->node)
+		return;
+
 	rproc_remove_subdev(rproc, &glink->subdev);
 	of_node_put(glink->node);
 }
@@ -165,6 +168,9 @@ EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
  */
 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
 {
+	if (!smd->node)
+		return;
+
 	rproc_remove_subdev(rproc, &smd->subdev);
 	of_node_put(smd->node);
 }