[PATCH v2 1/2] crypto: qat - Prevent dma mapping zero length assoc data

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Do not attempt to dma map associated data if it is zero length.

Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>
---
 drivers/crypto/qat/qat_common/qat_algs.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/qat/qat_common/qat_algs.c b/drivers/crypto/qat/qat_common/qat_algs.c
index 3e26fa2..bd4bd27 100644
--- a/drivers/crypto/qat/qat_common/qat_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_algs.c
@@ -608,6 +608,8 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
 		goto err;
 
 	for_each_sg(assoc, sg, assoc_n, i) {
+		if (!sg->length)
+			continue;
 		bufl->bufers[bufs].addr = dma_map_single(dev,
 							 sg_virt(sg),
 							 sg->length,

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