| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.15 58/72] crypto: x86/cast5-avx - fix ECB encryption when long sg follows short one | Date | Fri, 6 Apr 2018 15:24:33 +0200 |
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4.15-stable review patch. If anyone has any objections, please let me know.
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From: Eric Biggers <ebiggers@google.com>
commit 8f461b1e02ed546fbd0f11611138da67fd85a30f upstream.
With ecb-cast5-avx, if a 128+ byte scatterlist element followed a shorter one, then the algorithm accidentally encrypted/decrypted only 8 bytes instead of the expected 128 bytes. Fix it by setting the encryption/decryption 'fn' correctly.
Fixes: c12ab20b162c ("crypto: cast5/avx - avoid using temporary stack buffers") Cc: <stable@vger.kernel.org> # v3.8+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/crypto/cast5_avx_glue.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/arch/x86/crypto/cast5_avx_glue.c +++ b/arch/x86/crypto/cast5_avx_glue.c @@ -66,8 +66,6 @@ static int ecb_crypt(struct blkcipher_de void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src); int err; - fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way; - err = blkcipher_walk_virt(desc, walk); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; @@ -79,6 +77,7 @@ static int ecb_crypt(struct blkcipher_de /* Process multi-block batch */ if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) { + fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way; do { fn(ctx, wdst, wsrc);
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