diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2017-02-26 12:24:10 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-12 06:44:14 +0100 |
| commit | ddde9085f58cffb43100e9b0650b84a6b6534343 (patch) | |
| tree | 000f5e2bd8ff16928cd3ff03182d718842651423 /crypto | |
| parent | d5b190f8689ca43297ed19d793c67132bf505529 (diff) | |
crypto: xts - Propagate NEED_FALLBACK bit
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>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/xts.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/crypto/xts.c b/crypto/xts.c index 410a2e299085..baeb34dd8582 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -463,6 +463,7 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) 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 *tmpl, struct rtattr **tb) 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) |