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

[Greg Kroah-Hartman]

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

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

From: Gilad Ben-Yossef <gi...@benyossef.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: sta...@vger.kernel.org
Signed-off-by: Gilad Ben-Yossef <gi...@benyossef.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukher...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.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);