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authorHerbert Xu <herbert@gondor.apana.org.au>2017-02-26 12:24:10 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2017-02-27 18:09:41 +0800
commit89027579bc6c2febbcc9c2f9d5069adf71539e4b (patch)
tree4878354fc1ad7f49841254f915d6f77fc21150f6 /crypto
parent016df0abc56ec06d0c63c5318ef53e40738dea8b (diff)
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crypto: xts - Propagate NEED_FALLBACK bit
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. Cc: stable@vger.kernel.org #4.10 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>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/xts.c14
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)