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crypto: x86/crct10dif-pcl - fix use via crypto_shash_digest() 

The ->digest() method of crct10dif-pclmul reads the current CRC value
from the shash_desc context.  But this value is uninitialized, causing
crypto_shash_digest() to compute the wrong result.  Fix it.

Probably this wasn't noticed before because lib/crc-t10dif.c only uses
crypto_shash_update(), not crypto_shash_digest().  Likewise,
crypto_shash_digest() is not yet tested by the crypto self-tests because
those only test the ahash API which only uses shash init/update/final.

Fixes: 0b95a7f857 ("crypto: crct10dif - Glue code to cast accelerated CRCT10DIF assembly as a crypto transform")
Cc: <stable@vger.kernel.org> # v3.11+
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-03-31 13:04:13 -07:00 committed by Herbert Xu
parent 307508d107
commit dec3d0b107
1 changed files with 5 additions and 8 deletions
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13
arch/x86/crypto/crct10dif-pclmul_glue.c
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@ -71,15 +71,14 @@ static int chksum_final(struct shash_desc *desc, u8 *out)
return 0;
}
static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len,
u8 *out)
static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out)
{
if (len >= 16 && crypto_simd_usable()) {
kernel_fpu_begin();
*(__u16 *)out = crc_t10dif_pcl(*crcp, data, len);
*(__u16 *)out = crc_t10dif_pcl(crc, data, len);
kernel_fpu_end();
} else
*(__u16 *)out = crc_t10dif_generic(*crcp, data, len);
*(__u16 *)out = crc_t10dif_generic(crc, data, len);
return 0;
}
@ -88,15 +87,13 @@ static int chksum_finup(struct shash_desc *desc, const u8 *data,
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksum_finup(&ctx->crc, data, len, out);
return __chksum_finup(ctx->crc, data, len, out);
}
static int chksum_digest(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksum_finup(&ctx->crc, data, length, out);
return __chksum_finup(0, data, length, out);
}
static struct shash_alg alg = {