[PATCH] crypto: drbg - Fix unused value warning in drbg_healthcheck_sanity()

[PATCH] crypto: drbg - Fix unused value warning in drbg_healthcheck_sanity()

[Tim Gardner]

Coverity warns uf an unused value:

CID 44865 (#2 of 2): Unused value (UNUSED_VALUE)
assigned_value: Assigning value -14 to ret here, but that stored value is
overwritten before it can be used.
2006        int ret = -EFAULT;
...
value_overwrite: Overwriting previous write to ret with value from drbg_seed(drbg, &addtl, false).
2052        ret = drbg_seed(drbg, &addtl, false);

Fix this by removing the variable initializer.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
---
 crypto/drbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index ea85d4a0fe9e..f72f340a1321 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -2003,7 +2003,7 @@ static inline int __init drbg_healthcheck_sanity(void)
 #define OUTBUFLEN 16
 	unsigned char buf[OUTBUFLEN];
 	struct drbg_state *drbg = NULL;
-	int ret = -EFAULT;
+	int ret;
 	int rc = -EFAULT;
 	bool pr = false;
 	int coreref = 0;
-- 
2.33.0

Re: [PATCH] crypto: drbg - Fix unused value warning in drbg_healthcheck_sanity()

[Herbert Xu]

On Fri, Sep 10, 2021 at 01:01:17PM -0600, Tim Gardner wrote:
> Coverity warns uf an unused value:
> 
> CID 44865 (#2 of 2): Unused value (UNUSED_VALUE)
> assigned_value: Assigning value -14 to ret here, but that stored value is
> overwritten before it can be used.
> 2006        int ret = -EFAULT;
> ...
> value_overwrite: Overwriting previous write to ret with value from drbg_seed(drbg, &addtl, false).
> 2052        ret = drbg_seed(drbg, &addtl, false);
> 
> Fix this by removing the variable initializer.
> 
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: linux-crypto@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
> ---
>  crypto/drbg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt