From: Colin Ian King colin.king@canonical.com
[ Upstream commit 98b5ef3e97b16eaeeedb936f8bda3594ff84a70e ]
In the case where the dma_iv mapping fails, the return error path leaks the memory allocated to object d. Fix this by adding a new error return label and jumping to this to ensure d is free'd before the return.
Addresses-Coverity: ("Resource leak") Fixes: ac2614d721de ("crypto: sun8i-ss - Add support for the PRNG") Signed-off-by: Colin Ian King colin.king@canonical.com Acked-by: Corentin Labbe clabbe.montjoie@gmail.com Tested-by: Corentin Labbe clabbe.montjoie@gmail.com Acked-by: Corentin Labbe clabbe.montjoie@gmail.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c index 08a1473b2145..3191527928e4 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_free; }
dma_dst = dma_map_single(ss->dev, d, todo, DMA_FROM_DEVICE); @@ -167,6 +168,7 @@ err_iv: memcpy(ctx->seed, d + dlen, ctx->slen); } memzero_explicit(d, todo); +err_free: kfree(d);
return err;