[PATCH v2] 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,
the struct mtk_ring rising[i] will not be released,
causing a memory leak

Signed-off-by: Xiaoliang Pang <dawning.p...@gmail.com>
---
 drivers/crypto/mediatek/mtk-platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/mediatek/mtk-platform.c 
b/drivers/crypto/mediatek/mtk-platform.c
index 05d341e4a696..ebb3bdef0dbe 100644
--- a/drivers/crypto/mediatek/mtk-platform.c
+++ b/drivers/crypto/mediatek/mtk-platform.c
@@ -469,13 +469,13 @@ static int mtk_desc_ring_alloc(struct mtk_cryp *cryp)
        return 0;
 
 err_cleanup:
-       for (; i >= 0; --i) {
+       do {
                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,
                                  ring[i]->cmd_base, ring[i]->cmd_dma);
                kfree(ring[i]);
-       }
+       }while(i--);
        return err;
 }
 
-- 
2.17.1