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Subject[PATCH 4.10 095/167] crypto: xts - Propagate NEED_FALLBACK bit
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@gondor.apana.org.au>

commit 89027579bc6c2febbcc9c2f9d5069adf71539e4b upstream.

When we're used as a fallback algorithm, we should propagate
the NEED_FALLBACK bit when searching for the underlying ECB mode.

This just happens to fix a hang too because otherwise the search
may end up loading the same module that triggered this XTS creation.

Fixes: f1c131b45410 ("crypto: xts - Convert to skcipher")
Reported-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
crypto/xts.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -463,6 +463,7 @@ static int create(struct crypto_template
struct xts_instance_ctx *ctx;
struct skcipher_alg *alg;
const char *cipher_name;
+ u32 mask;
int err;

algt = crypto_get_attr_type(tb);
@@ -483,18 +484,19 @@ static int create(struct crypto_template
ctx = skcipher_instance_ctx(inst);

crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst));
- err = crypto_grab_skcipher(&ctx->spawn, cipher_name, 0,
- crypto_requires_sync(algt->type,
- algt->mask));
+
+ mask = crypto_requires_off(algt->type, algt->mask,
+ CRYPTO_ALG_NEED_FALLBACK |
+ CRYPTO_ALG_ASYNC);
+
+ err = crypto_grab_skcipher(&ctx->spawn, cipher_name, 0, mask);
if (err == -ENOENT) {
err = -ENAMETOOLONG;
if (snprintf(ctx->name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;

- err = crypto_grab_skcipher(&ctx->spawn, ctx->name, 0,
- crypto_requires_sync(algt->type,
- algt->mask));
+ err = crypto_grab_skcipher(&ctx->spawn, ctx->name, 0, mask);
}

if (err)

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