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From:   Wen Yang <wen.yang99@zte.com.cn>
To:     linux-kernel@vger.kernel.org
Cc:     wang.yi59@zte.com.cn, Wen Yang <wen.yang99@zte.com.cn>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 4/5] powerpc/embedded6xx: fix possible object reference leak
Date:   Fri, 22 Mar 2019 11:05:54 +0800
Message-Id: <1553223955-7350-4-git-send-email-wen.yang99@zte.com.cn>
In-Reply-To: <1553223955-7350-1-git-send-email-wen.yang99@zte.com.cn>
References: <1553223955-7350-1-git-send-email-wen.yang99@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
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The call to of_find_compatible_node returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./arch/powerpc/platforms/embedded6xx/mvme5100.c:89:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 80, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
---
 arch/powerpc/platforms/embedded6xx/mvme5100.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/embedded6xx/mvme5100.c b/arch/powerpc/platforms/embedded6xx/mvme5100.c
index 273dfa3..660654f4 100644
--- a/arch/powerpc/platforms/embedded6xx/mvme5100.c
+++ b/arch/powerpc/platforms/embedded6xx/mvme5100.c
@@ -86,6 +86,7 @@ static void __init mvme5100_pic_init(void)
 	cirq = irq_of_parse_and_map(cp, 0);
 	if (!cirq) {
 		pr_warn("mvme5100_pic_init: no cascade interrupt?\n");
+		of_node_put(cp);
 		return;
 	}
 
-- 
2.9.5