linux-kernel - [PATCH V1 4/4] net: qrtr: Check function pointer before calling

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Date:   Sun, 30 Aug 2020 20:08:12 +0530
From:   Deepak Kumar Singh <deesin@...eaurora.org>
To:     bjorn.andersson@...aro.org, clew@...eaurora.org
Cc:     mathieu.poirier@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arun Kumar Neelakantam <aneela@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Carl Huang <cjhuang@...eaurora.org>,
        Necip Fazil Yildiran <necip@...gle.com>,
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL])
Subject: [PATCH V1 4/4] net: qrtr: Check function pointer before calling

From: Arun Kumar Neelakantam <aneela@...eaurora.org>

sk_error_report callback function called without validating cause the NULL
pointer dereference.

Validate function pointer before using for error report.
---
 net/qrtr/qrtr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index e2dd38e..01cabd3 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -786,7 +786,8 @@ static void qrtr_reset_ports(void)
 
 		sock_hold(&ipc->sk);
 		ipc->sk.sk_err = ENETRESET;
-		ipc->sk.sk_error_report(&ipc->sk);
+		if (ipc->sk.sk_error_report)
+			ipc->sk.sk_error_report(&ipc->sk);
 		sock_put(&ipc->sk);
 	}
 	mutex_unlock(&qrtr_port_lock);
-- 
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