linux-kernel - [PATCH] crypto: glue_helper: remove redundant check on nbytes

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Message-Id: <20170510130431.21236-1-colin.king@canonical.com>
Date:   Wed, 10 May 2017 14:04:31 +0100
From:   Colin King <colin.king@...onical.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-crypto@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: glue_helper: remove redundant check on nbytes < bsize

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

There is a check to see if nbytes < bsize (and a jump to label 'done' if
it is true) inside the proceeding do-while loop so it is impossible for
the second nbytes < bsize check to be true, hence is it redundant and
can be removed. Remove it.

Detected by CoverityScan, CID#712347 ("Logically dead code")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/x86/crypto/glue_helper.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c
index 24ac9fad832d..d61e57960fe0 100644
--- a/arch/x86/crypto/glue_helper.c
+++ b/arch/x86/crypto/glue_helper.c
@@ -176,9 +176,6 @@ __glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
 				src -= 1;
 				dst -= 1;
 			} while (nbytes >= func_bytes);
-
-			if (nbytes < bsize)
-				goto done;
 		}
 	}
 
-- 
2.11.0