linux-kernel - [PATCH 3/7] crypto: ccree: fix free of unallocated mlli buffer

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Date:   Tue, 15 Jan 2019 15:43:13 +0200
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Hadar Gat <hadar.gat@....com>, stable@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] crypto: ccree: fix free of unallocated mlli buffer

From: Hadar Gat <hadar.gat@....com>

In cc_unmap_aead_request(), call dma_pool_free() for mlli buffer only
if an item is allocated from the pool and not always if there is a
pool allocated.
This fixes a kernel panic when trying to free a non-allocated item.

Cc: stable@...r.kernel.org
Signed-off-by: Hadar Gat <hadar.gat@....com>
Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
---
 drivers/crypto/ccree/cc_buffer_mgr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
index 237a87a57830..0ee1c52da0a4 100644
--- a/drivers/crypto/ccree/cc_buffer_mgr.c
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -614,10 +614,10 @@ void cc_unmap_aead_request(struct device *dev, struct aead_request *req)
 				 hw_iv_size, DMA_BIDIRECTIONAL);
 	}
 
-	/*In case a pool was set, a table was
-	 *allocated and should be released
-	 */
-	if (areq_ctx->mlli_params.curr_pool) {
+	/* Release pool */
+	if ((areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
+	     areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) &&
+	    (areq_ctx->mlli_params.mlli_virt_addr)) {
 		dev_dbg(dev, "free MLLI buffer: dma=%pad virt=%pK\n",
 			&areq_ctx->mlli_params.mlli_dma_addr,
 			areq_ctx->mlli_params.mlli_virt_addr);
-- 
2.20.1