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From:   Christian Lamparter <chunkeey@gmail.com>
To:     linux-crypto@vger.kernel.org
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>
Subject: [PATCH] crypto: crypto4xx - fix double-free in crypto4xx_destroy_sdr
Date:   Thu, 31 Oct 2019 17:14:38 +0100
Message-Id: <20191031161438.4806-1-chunkeey@gmail.com>
MIME-Version: 1.0
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Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

This patch fixes a crash that can happen during probe
when the available dma memory is not enough (this can
happen if the crypto4xx is built as a module).

The descriptor window mapping would end up being free'd
twice, once in crypto4xx_build_pdr() and the second time
in crypto4xx_destroy_sdr().

Fixes: 5d59ad6eea82 ("crypto: crypto4xx - fix crypto4xx_build_pdr, crypto4xx_build_sdr leak")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---
 drivers/crypto/amcc/crypto4xx_core.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c
index de5e9352e920..7d6b695c4ab3 100644
--- a/drivers/crypto/amcc/crypto4xx_core.c
+++ b/drivers/crypto/amcc/crypto4xx_core.c
@@ -365,12 +365,8 @@ static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
 		dma_alloc_coherent(dev->core_dev->device,
 			PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD,
 			&dev->scatter_buffer_pa, GFP_ATOMIC);
-	if (!dev->scatter_buffer_va) {
-		dma_free_coherent(dev->core_dev->device,
-				  sizeof(struct ce_sd) * PPC4XX_NUM_SD,
-				  dev->sdr, dev->sdr_pa);
+	if (!dev->scatter_buffer_va)
 		return -ENOMEM;
-	}
 
 	for (i = 0; i < PPC4XX_NUM_SD; i++) {
 		dev->sdr[i].ptr = dev->scatter_buffer_pa +
-- 
2.24.0.rc2