crypto: skcipher - Copy iv from desc even for 0-len walks
authorJason A. Donenfeld <>
Sun, 6 Dec 2015 01:51:37 +0000 (02:51 +0100)
committerBen Hutchings <>
Fri, 22 Jan 2016 21:40:03 +0000 (21:40 +0000)
commit 70d906bc17500edfa9bdd8c8b7e59618c7911613 upstream.

Some ciphers actually support encrypting zero length plaintexts. For
example, many AEAD modes support this. The resulting ciphertext for
those winds up being only the authentication tag, which is a result of
the key, the iv, the additional data, and the fact that the plaintext
had zero length. The blkcipher constructors won't copy the IV to the
right place, however, when using a zero length input, resulting in
some significant problems when ciphers call their initialization
routines, only to find that the ->iv parameter is uninitialized. One
such example of this would be using chacha20poly1305 with a zero length
input, which then calls chacha20, which calls the key setup routine,
which eventually OOPSes due to the uninitialized ->iv member.

Signed-off-by: Jason A. Donenfeld <>
Signed-off-by: Herbert Xu <>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <>

index d53a30b..6eb6eb1 100644 (file)
@@ -280,12 +280,12 @@ static int ablkcipher_walk_first(struct ablkcipher_request *req,
        if (WARN_ON_ONCE(in_irq()))
                return -EDEADLK;
+       walk->iv = req->info;
        walk->nbytes = walk->total;
        if (unlikely(!walk->total))
                return 0;
        walk->iv_buffer = NULL;
-       walk->iv = req->info;
        if (unlikely(((unsigned long)walk->iv & alignmask))) {
                int err = ablkcipher_copy_iv(walk, tfm, alignmask);
                if (err)
index 04f0f38..3041504 100644 (file)
@@ -329,12 +329,12 @@ static int blkcipher_walk_first(struct blkcipher_desc *desc,
        if (WARN_ON_ONCE(in_irq()))
                return -EDEADLK;
+       walk->iv = desc->info;
        walk->nbytes = walk->total;
        if (unlikely(!walk->total))
                return 0;
        walk->buffer = NULL;
-       walk->iv = desc->info;
        if (unlikely(((unsigned long)walk->iv & alignmask))) {
                int err = blkcipher_copy_iv(walk, tfm, alignmask);
                if (err)