From 988dc0174411ad4b98c173f3d7d25aca9e56cd85 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 16 Jan 2015 19:38:17 +1100
Subject: [PATCH] crypto: cts - Weed out non-CBC algorithms
The cts algorithm as currently implemented assumes the underlying
is a CBC-mode algorithm. So this patch adds a check for that to
eliminate bogus combinations of cts with non-CBC modes.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
crypto/cts.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/crypto/cts.c b/crypto/cts.c
index 6a8089c4d4b42..e467ec0acf9f0 100644
--- a/crypto/cts.c
+++ b/crypto/cts.c
@@ -290,6 +290,9 @@ static struct crypto_instance *crypto_cts_alloc(struct rtattr **tb)
if (!is_power_of_2(alg->cra_blocksize))
goto out_put_alg;
+ if (strncmp(alg->cra_name, "cbc(", 4))
+ goto out_put_alg;
+
inst = crypto_alloc_instance("cts", alg);
if (IS_ERR(inst))
goto out_put_alg;
--
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