linux-kernel - [PATCH 4.9 082/223] crypto: crypto4xx - fix a potential double free in ppc4xx_trng

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Message-Id: <20190802092244.274402583@linuxfoundation.org>
Date:   Fri,  2 Aug 2019 11:35:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wen Yang <wen.yang99@....com.cn>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Armijn Hemel <armijn@...ldur.nl>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        linux-crypto@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.9 082/223] crypto: crypto4xx - fix a potential double free in ppc4xx_trng_probe

From: Wen Yang <wen.yang99@....com.cn>

commit 95566aa75cd6b3b404502c06f66956b5481194b3 upstream.

There is a possible double free issue in ppc4xx_trng_probe():

85:	dev->trng_base = of_iomap(trng, 0);
86:	of_node_put(trng);          ---> released here
87:	if (!dev->trng_base)
88:		goto err_out;
...
110:	ierr_out:
111:		of_node_put(trng);  ---> double released here
...

This issue was detected by using the Coccinelle software.
We fix it by removing the unnecessary of_node_put().

Fixes: 5343e674f32f ("crypto4xx: integrate ppc4xx-rng into crypto4xx")
Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: <stable@...r.kernel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Allison Randal <allison@...utok.net>
Cc: Armijn Hemel <armijn@...ldur.nl>
Cc: Julia Lawall <Julia.Lawall@...6.fr>
Cc: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Acked-by: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/amcc/crypto4xx_trng.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/crypto/amcc/crypto4xx_trng.c
+++ b/drivers/crypto/amcc/crypto4xx_trng.c
@@ -111,7 +111,6 @@ void ppc4xx_trng_probe(struct crypto4xx_
 	return;

 err_out:
-	of_node_put(trng);
 	iounmap(dev->trng_base);
 	kfree(rng);
 	dev->trng_base = NULL;