From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Corentin Labbe <clabbe.montjoie@gmail.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Sasha Levin <sashal@kernel.org>,
linux-crypto@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 027/114] crypto: sun4i-ss - Fix invalid calculation of hash end
Date: Wed, 22 May 2019 15:28:50 -0400 [thread overview]
Message-ID: <20190522193017.26567-27-sashal@kernel.org> (raw)
In-Reply-To: <20190522193017.26567-1-sashal@kernel.org>
From: Corentin Labbe <clabbe.montjoie@gmail.com>
[ Upstream commit f87391558acf816b48f325a493d81d45dec40da0 ]
When nbytes < 4, end is wronlgy set to a negative value which, due to
uint, is then interpreted to a large value leading to a deadlock in the
following code.
This patch fix this problem.
Fixes: 6298e948215f ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Signed-off-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/sunxi-ss/sun4i-ss-hash.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
index 0de2f62d51ff7..ec16ec2e284d0 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
@@ -250,7 +250,10 @@ static int sun4i_hash(struct ahash_request *areq)
}
} else {
/* Since we have the flag final, we can go up to modulo 4 */
- end = ((areq->nbytes + op->len) / 4) * 4 - op->len;
+ if (areq->nbytes < 4)
+ end = 0;
+ else
+ end = ((areq->nbytes + op->len) / 4) * 4 - op->len;
}
/* TODO if SGlen % 4 and op->len == 0 then DMA */
--
2.20.1
parent reply other threads:[~2019-05-22 19:35 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20190522193017.26567-1-sashal@kernel.org>]
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