Commit 3e95cd3d authored by Eric Biggers's avatar Eric Biggers Committed by Greg Kroah-Hartman

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

commit dec3d0b1 upstream.

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: 0b95a7f8 ("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: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b841777e
...@@ -70,15 +70,14 @@ static int chksum_final(struct shash_desc *desc, u8 *out) ...@@ -70,15 +70,14 @@ static int chksum_final(struct shash_desc *desc, u8 *out)
return 0; return 0;
} }
static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len, static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out)
u8 *out)
{ {
if (len >= 16 && irq_fpu_usable()) { if (len >= 16 && irq_fpu_usable()) {
kernel_fpu_begin(); kernel_fpu_begin();
*(__u16 *)out = crc_t10dif_pcl(*crcp, data, len); *(__u16 *)out = crc_t10dif_pcl(crc, data, len);
kernel_fpu_end(); kernel_fpu_end();
} else } else
*(__u16 *)out = crc_t10dif_generic(*crcp, data, len); *(__u16 *)out = crc_t10dif_generic(crc, data, len);
return 0; return 0;
} }
...@@ -87,15 +86,13 @@ static int chksum_finup(struct shash_desc *desc, const u8 *data, ...@@ -87,15 +86,13 @@ static int chksum_finup(struct shash_desc *desc, const u8 *data,
{ {
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 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, static int chksum_digest(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out) unsigned int length, u8 *out)
{ {
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); return __chksum_finup(0, data, length, out);
return __chksum_finup(&ctx->crc, data, length, out);
} }
static struct shash_alg alg = { static struct shash_alg alg = {
......
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