UPSTREAM: crypto: adiantum - initialize crypto_spawn::inst

crypto_grab_*() doesn't set crypto_spawn::inst, so templates must set it
beforehand.  Otherwise it will be left NULL, which causes a crash in
certain cases where algorithms are dynamically loaded/unloaded.  E.g.
with CONFIG_CRYPTO_CHACHA20_X86_64=m, the following caused a crash:

    insmod chacha-x86_64.ko
    python -c 'import socket; socket.socket(socket.AF_ALG, 5, 0).bind(("skcipher", "adiantum(xchacha12,aes)"))'
    rmmod chacha-x86_64.ko
    python -c 'import socket; socket.socket(socket.AF_ALG, 5, 0).bind(("skcipher", "adiantum(xchacha12,aes)"))'

Fixes: 059c2a4d8e16 ("crypto: adiantum - add Adiantum support")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 6db43410179bc40419a9859ebb333f178a49829d)
Test: Adiantum self-tests
Change-Id: I248548c979b0ee9e63a35f8ae779741bb5967b6e

diff --git a/crypto/adiantum.c b/crypto/adiantum.c
index 6651e71..5564e73 100644 (file)
--- a/crypto/adiantum.c
+++ b/crypto/adiantum.c
@@ -539,6 +539,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
        ictx = skcipher_instance_ctx(inst);
 
        /* Stream cipher, e.g. "xchacha12" */
+       crypto_set_skcipher_spawn(&ictx->streamcipher_spawn,
+                                 skcipher_crypto_instance(inst));
        err = crypto_grab_skcipher(&ictx->streamcipher_spawn, streamcipher_name,
                                   0, crypto_requires_sync(algt->type,
                                                           algt->mask));
@@ -547,6 +549,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
        streamcipher_alg = crypto_spawn_skcipher_alg(&ictx->streamcipher_spawn);
 
        /* Block cipher, e.g. "aes" */
+       crypto_set_spawn(&ictx->blockcipher_spawn,
+                        skcipher_crypto_instance(inst));
        err = crypto_grab_spawn(&ictx->blockcipher_spawn, blockcipher_name,
                                CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK);
        if (err)