From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 21 Apr 2015 02:46:49 +0000 (+0800)
Subject: crypto: rng - Zero seed in crypto_rng_reset
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b617b702da4e922277806f81c411d3051107d462;p=openwrt%2Fstaging%2Fblogic.git

crypto: rng - Zero seed in crypto_rng_reset

If we allocate a seed on behalf ot the user in crypto_rng_reset,
we must ensure that it is zeroed afterwards or the RNG may be
compromised.

Reported-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/rng.c b/crypto/rng.c
index 055e276427b1..13155058b193 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -53,7 +53,7 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
 
 	err = crypto_rng_alg(tfm)->seed(tfm, seed, slen);
 
-	kfree(buf);
+	kzfree(buf);
 	return err;
 }
 EXPORT_SYMBOL_GPL(crypto_rng_reset);