From: Colin King <colin.king@canonical.com>
To: Corentin Labbe <clabbe.montjoie@gmail.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
Jernej Skrabec <jernej.skrabec@siol.net>,
linux-crypto@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] crypto: sun8i-ss: Fix memory leak of object d when dma_iv fails to map
Date: Tue, 2 Mar 2021 16:34:46 +0000 [thread overview]
Message-ID: <20210302163446.21047-1-colin.king@canonical.com> (raw)
From: Colin Ian King <colin.king@canonical.com>
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>
---
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 @@ int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
memcpy(ctx->seed, d + dlen, ctx->slen);
}
memzero_explicit(d, todo);
+err_free:
kfree(d);
return err;
--
2.30.0
next reply other threads:[~2021-03-03 6:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 16:34 Colin King [this message]
2021-03-02 16:40 ` [PATCH] crypto: sun8i-ss: Fix memory leak of object d when dma_iv fails to map Corentin Labbe
2021-03-09 6:45 ` Corentin Labbe
2021-03-12 13:12 ` Herbert Xu
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