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| author | Eric Biggers <ebiggers@google.com> | 2019-03-31 13:04:12 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-04-08 14:42:54 +0800 |
| commit | 307508d1072979f4435416f87936f87eaeb82054 (patch) | |
| tree | 9f2e878011b42b01f041de09a50f3e839c44f684 /crypto/crct10dif_generic.c | |
| parent | f947d7fd12ab1ffddd4f25970ff6c06a879226e6 (diff) | |
| download | lwn-307508d1072979f4435416f87936f87eaeb82054.tar.gz lwn-307508d1072979f4435416f87936f87eaeb82054.zip | |
crypto: crct10dif-generic - fix use via crypto_shash_digest()
The ->digest() method of crct10dif-generic 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.
This bug was detected by my patches that improve testmgr to fuzz
algorithms against their generic implementation.
Fixes: 2d31e518a428 ("crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework")
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>
Diffstat (limited to 'crypto/crct10dif_generic.c')
| -rw-r--r-- | crypto/crct10dif_generic.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/crypto/crct10dif_generic.c b/crypto/crct10dif_generic.c index 8e94e29dc6fc..d08048ae5552 100644 --- a/crypto/crct10dif_generic.c +++ b/crypto/crct10dif_generic.c @@ -65,10 +65,9 @@ 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) { - *(__u16 *)out = crc_t10dif_generic(*crcp, data, len); + *(__u16 *)out = crc_t10dif_generic(crc, data, len); return 0; } @@ -77,15 +76,13 @@ 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 = { |