[PATCH] cypto: mediatek - fix leaks in mtk_desc_ring_alloc

[Xiaoliang Pang]

In the init loop, if an error occurs in function 'dma_alloc_coherent',
then goto the err_cleanup section,
in the cleanup loop, after run i--, 
the struct mtk_ring rising[i] will not be released,
causing a memory leak

Signed-off-by: Xiaoliang Pang <dawning.pang at gmail.com>
---
 drivers/crypto/mediatek/mtk-platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/mediatek/mtk-platform.c b/drivers/crypto/mediatek/mtk-platform.c
index 7e3ad085b5bd..05d341e4a696 100644
--- a/drivers/crypto/mediatek/mtk-platform.c
+++ b/drivers/crypto/mediatek/mtk-platform.c
@@ -469,7 +469,7 @@ static int mtk_desc_ring_alloc(struct mtk_cryp *cryp)
 	return 0;
 
 err_cleanup:
-	for (; i--; ) {
+	for (; i >= 0; --i) {
 		dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
 				  ring[i]->res_base, ring[i]->res_dma);
 		dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
-- 
2.17.1