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crypto: sun4i-ss - Fix invalid calculation of hash end 

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: 6298e94821 ("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>
This commit is contained in:
Corentin Labbe 2019-04-18 10:17:34 +02:00 committed by Herbert Xu
parent 179930a62f
commit f87391558a
1 changed files with 4 additions and 1 deletions
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5
drivers/crypto/sunxi-ss/sun4i-ss-hash.c
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@ -240,7 +240,10 @@ 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 then DMA */