linux-kernel - [PATCH 4.14 37/41] staging: ccree: check DMA pool buf !NULL before free

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Message-Id: <20181018175423.130138270@linuxfoundation.org>
Date:   Thu, 18 Oct 2018 19:54:52 +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, Gilad Ben-Yossef <gilad@...yossef.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 37/41] staging: ccree: check DMA pool buf !NULL before free

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gilad Ben-Yossef <gilad@...yossef.com>

commit 2f7caf6b02145bd9cd9d0b56204f51a5fefe7790 upstream.

If we ran out of DMA pool buffers, we get into the unmap
code path with a NULL before. Deal with this by checking
the virtual mapping is not NULL.

Cc: stable@...r.kernel.org
Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/ccree/ssi_buffer_mgr.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/ccree/ssi_buffer_mgr.c
+++ b/drivers/staging/ccree/ssi_buffer_mgr.c
@@ -492,7 +492,8 @@ void ssi_buffer_mgr_unmap_blkcipher_requ
 				 DMA_TO_DEVICE);
 	}
 	/* Release pool */
-	if (req_ctx->dma_buf_type == SSI_DMA_BUF_MLLI) {
+	if (req_ctx->dma_buf_type == SSI_DMA_BUF_MLLI &&
+	    req_ctx->mlli_params.mlli_virt_addr) {
 		dma_pool_free(req_ctx->mlli_params.curr_pool,
 			      req_ctx->mlli_params.mlli_virt_addr,
 			      req_ctx->mlli_params.mlli_dma_addr);