4.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxx> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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)