linux-kernel - [PATCH -next] s390/crypto: Fix unsigned variable compared with zero

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Date:   Thu, 14 Nov 2019 15:30:05 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <heiko.carstens@...ibm.com>, <gor@...ux.ibm.com>,
        <borntraeger@...ibm.com>, <freude@...ux.ibm.com>,
        <ifranzki@...ux.ibm.com>, <jschmidb@...ibm.com>
CC:     <linux-crypto@...r.kernel.org>, <linux-s390@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] s390/crypto: Fix unsigned variable compared with zero

s390_crypto_shash_parmsize() return type is int, it
should not be stored in a unsigned variable, which
compared with zero.

Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: 3c2eb6b76cab ("s390/crypto: Support for SHA3 via CPACF (MSA6)")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 arch/s390/crypto/sha_common.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
index d39e0f0..686fe7a 100644
--- a/arch/s390/crypto/sha_common.c
+++ b/arch/s390/crypto/sha_common.c
@@ -74,14 +74,17 @@ int s390_sha_final(struct shash_desc *desc, u8 *out)
 	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
 	unsigned int bsize = crypto_shash_blocksize(desc->tfm);
 	u64 bits;
-	unsigned int n, mbl_offset;
+	unsigned int n;
+	int mbl_offset;
 
 	n = ctx->count % bsize;
 	bits = ctx->count * 8;
-	mbl_offset = s390_crypto_shash_parmsize(ctx->func) / sizeof(u32);
+	mbl_offset = s390_crypto_shash_parmsize(ctx->func);
 	if (mbl_offset < 0)
 		return -EINVAL;
 
+	mbl_offset = mbl_offset / sizeof(u32);
+
 	/* set total msg bit length (mbl) in CPACF parmblock */
 	switch (ctx->func) {
 	case CPACF_KLMD_SHA_1:
-- 
2.7.4