linux-kernel - [PATCH 10/12] interconnect: Check for valid path in icc_set

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Date:   Fri, 17 Jan 2020 11:58:14 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 10/12] interconnect: Check for valid path in icc_set_bw()

Use IS_ERR() to ensure that the path passed to icc_set_bw() is valid.

Reviewed-by: Evan Green <evgreen@...omium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---
 drivers/interconnect/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 10dde5df9251..f277e467156f 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -495,9 +495,12 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
 	size_t i;
 	int ret;
 
-	if (!path || !path->num_nodes)
+	if (!path)
 		return 0;
 
+	if (WARN_ON(IS_ERR(path) || !path->num_nodes))
+		return -EINVAL;
+
 	mutex_lock(&icc_lock);
 
 	old_avg = path->reqs[0].avg_bw;