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s390/crypto: Fix unsigned variable compared with zero

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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@huawei.com>
Fixes: 3c2eb6b76c ("s390/crypto: Support for SHA3 via CPACF (MSA6)")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Joerg Schmidbauer <jschmidb@linux.vnet.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
YueHaibing 2019-11-14 15:30:05 +08:00 committed by Vasily Gorbik
parent 8b57e7c852
commit 0398d4ab16
1 changed files with 5 additions and 2 deletions
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7
arch/s390/crypto/sha_common.c
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@ -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: