linux-kernel - [PATCH][V2] s390/crypto: initialize ret to nbytes to avoid returning garbage value

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Message-Id: <20160906072513.7210-1-colin.king@canonical.com>
Date:   Tue,  6 Sep 2016 08:25:13 +0100
From:   Colin King <colin.king@...onical.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-crypto@...r.kernel.org, linux-s390@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH][V2] s390/crypto: initialize ret to nbytes to avoid returning garbage value

From: Colin Ian King <colin.king@...onical.com>

Static analysis with cppcheck detected that ret is not initialized
and hence garbage is potentially being returned in the case where
prng_data->ppnows.reseed_counter <= prng_reseed_limit.

Thanks to Martin Schwidefsky for spotting a mistake in my original
fix.

Fixes: 0177db01adf26cf9 ("s390/crypto: simplify return code handling")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/s390/crypto/prng.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c
index 79e3a1f..5592df9 100644
--- a/arch/s390/crypto/prng.c
+++ b/arch/s390/crypto/prng.c
@@ -412,7 +412,7 @@ static int prng_sha512_reseed(void)
 
 static int prng_sha512_generate(u8 *buf, size_t nbytes)
 {
-	int ret;
+	int ret = nbytes;
 
 	/* reseed needed ? */
 	if (prng_data->ppnows.reseed_counter > prng_reseed_limit) {
-- 
2.9.3