request for 4.14-stable: 2f7caf6b0214 ("staging: ccree: check DMA pool buf !NULL before free")

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

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Hi Greg,

This was missing in 4.14-stable. Please apply to your queue.

--
Regards
Sudip

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>From 54d3be6bb683da40fc5bc6b89b6553ca83030fe9 Mon Sep 17 00:00:00 2001
From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Sun, 7 Jan 2018 12:14:24 +0000
Subject: [PATCH] staging: ccree: check DMA pool buf !NULL before free

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

diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c b/drivers/staging/ccree/ssi_buffer_mgr.c
index 63936091d524..4ba6e9c422c4 100644
--- 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_request(
 				 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);
-- 
2.11.0