[PATCH 2/4] crypto: qcom-rng - Allow zero as a random number
From: Eric Biggers
Date: Fri May 29 2026 - 22:11:23 EST
Zero is a valid random number and needs to be allowed. Otherwise the
output is distinguishable from random.
Fixes: f29cd5bb64c2 ("crypto: qcom-rng - Add hw_random interface support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
drivers/crypto/qcom-rng.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
index f31a7fe07ba7..b7f3b9695dac 100644
--- a/drivers/crypto/qcom-rng.c
+++ b/drivers/crypto/qcom-rng.c
@@ -63,13 +63,10 @@ static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)
200, 10000);
if (ret)
return ret;
val = readl_relaxed(rng->base + PRNG_DATA_OUT);
- if (!val)
- return -EINVAL;
-
if ((max - currsize) >= WORD_SZ) {
memcpy(data, &val, WORD_SZ);
data += WORD_SZ;
currsize += WORD_SZ;
} else {
--
2.54.0