linux-kernel - [PATCH] crypto: qat: Fix a double free in adf_create

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Message-Id: <20210402171348.3581-1-lyl2019@mail.ustc.edu.cn>
Date:   Fri,  2 Apr 2021 10:13:48 -0700
From:   Lv Yunlong <lyl2019@...l.ustc.edu.cn>
To:     giovanni.cabiddu@...el.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, andriy.shevchenko@...ux.intel.com,
        wojciech.ziemba@...el.com, fiona.trahe@...el.com
Cc:     qat-linux@...el.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Subject: [PATCH] crypto: qat: Fix a double free in adf_create_ring

In adf_create_ring, if the callee adf_init_ring() failed, the callee will
free the ring->base_addr by dma_free_coherent() and return -EFAULT. Then
adf_create_ring will goto err and the ring->base_addr will be freed again
in adf_cleanup_ring().

My patch sets ring->base_addr to NULL after the first freed to avoid the
double free.

Fixes: a672a9dc872ec ("crypto: qat - Intel(R) QAT transport code")
Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
---
 drivers/crypto/qat/qat_common/adf_transport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/qat/qat_common/adf_transport.c b/drivers/crypto/qat/qat_common/adf_transport.c
index 888c1e047295..8ba28409fb74 100644
--- a/drivers/crypto/qat/qat_common/adf_transport.c
+++ b/drivers/crypto/qat/qat_common/adf_transport.c
@@ -172,6 +172,7 @@ static int adf_init_ring(struct adf_etr_ring_data *ring)
 		dev_err(&GET_DEV(accel_dev), "Ring address not aligned\n");
 		dma_free_coherent(&GET_DEV(accel_dev), ring_size_bytes,
 				  ring->base_addr, ring->dma_addr);
+		ring->base_addr = NULL;
 		return -EFAULT;
 	}
 
-- 
2.25.1