[PATCH][next] crypto: sun8i-ss - Fix memory leak in sun8i_ss_prng_generate()

Gustavo A. R. Silva
2020-09-28T17:54:08Z

Set _err_ to the return error code -EFAULT before jumping to the new
label err_d, so resources for _d_ can be released before returning
from function sun8i_ss_prng_generate().

Addresses-Coverity-ID: 1497459 ("Resource leak")
Fixes: ac2614d721de ("crypto: sun8i-ss - Add support for the PRNG")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c
index 08a1473b2145..0573f6289e8b 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c
@@ -103,7 +103,8 @@ int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
dma_iv = dma_map_single(ss->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE);
if (dma_mapping_error(ss->dev, dma_iv)) {
dev_err(ss->dev, "Cannot DMA MAP IV\n");
- return -EFAULT;
+ err = -EFAULT;
+ goto err_d;
}

dma_dst = dma_map_single(ss->dev, d, todo, DMA_FROM_DEVICE);
@@ -160,7 +161,7 @@ int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
dma_unmap_single(ss->dev, dma_dst, todo, DMA_FROM_DEVICE);
err_iv:
dma_unmap_single(ss->dev, dma_iv, ctx->slen, DMA_TO_DEVICE);
-
+err_d:
if (!err) {
memcpy(dst, d, dlen);
/* Update seed */
--
2.27.0