[PATCH] crypto: allwinner: sun8i-ce: fix two error path's memory leak

[Corentin Labbe]

This patch fixes the following smatch warnings:
drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c:412
sun8i_ce_hash_run() warn: possible memory leak of 'result'
Note: "buf" is leaked as well.

Furthermore, in case of ENOMEM, crypto_finalize_hash_request() was not
called which was an error.

Fixes: 56f6d5aee88d ("crypto: sun8i-ce - support hash algorithms")
Reported-by: kernel test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Corentin Labbe <cla...@baylibre.com>
---
 .../crypto/allwinner/sun8i-ce/sun8i-ce-hash.c | 20 +++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c 
b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
index a94bf28f858a..4c5a2c11d714 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
@@ -262,13 +262,13 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void 
*breq)
        u32 common;
        u64 byte_count;
        __le32 *bf;
-       void *buf;
+       void *buf = NULL;
        int j, i, todo;
        int nbw = 0;
        u64 fill, min_fill;
        __be64 *bebits;
        __le64 *lebits;
-       void *result;
+       void *result = NULL;
        u64 bs;
        int digestsize;
        dma_addr_t addr_res, addr_pad;
@@ -285,13 +285,17 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void 
*breq)
 
        /* the padding could be up to two block. */
        buf = kzalloc(bs * 2, GFP_KERNEL | GFP_DMA);
-       if (!buf)
-               return -ENOMEM;
+       if (!buf) {
+               err = -ENOMEM;
+               goto theend;
+       }
        bf = (__le32 *)buf;
 
        result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
-       if (!result)
-               return -ENOMEM;
+       if (!result) {
+               err = -ENOMEM;
+               goto theend;
+       }
 
        flow = rctx->flow;
        chan = &ce->chanlist[flow];
@@ -403,11 +407,11 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void 
*breq)
        dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
        dma_unmap_single(ce->dev, addr_res, digestsize, DMA_FROM_DEVICE);
 
-       kfree(buf);
 
        memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
-       kfree(result);
 theend:
+       kfree(buf);
+       kfree(result);
        crypto_finalize_hash_request(engine, breq, err);
        return 0;
 }
-- 
2.26.2