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crypto: qcom-rng - Allow zero as a random number

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Zero is a valid random number and needs to be allowed.  Otherwise the
output is distinguishable from random.

Fixes: f29cd5bb64 ("crypto: qcom-rng - Add hw_random interface support")
Cc: stable@vger.kernel.org
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2026-06-08 17:58:46 +00:00 committed by Herbert Xu
parent 0fd97bbda2
commit 4ef04bdc0c
1 changed files with 0 additions and 2 deletions
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2
drivers/crypto/qcom-rng.c
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@ -65,8 +65,6 @@ static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)
return ret;
val = readl_relaxed(rng->base + PRNG_DATA_OUT);
if (!val)
return -EINVAL;
if ((max - currsize) >= WORD_SZ) {
memcpy(data, &val, WORD_SZ);