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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: 059c2a4d8e ("crypto: adiantum - add Adiantum support")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-01-06 12:46:05 -08:00 committed by Herbert Xu
parent 06bbf75347
commit 6db4341017
1 changed files with 4 additions and 0 deletions
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4
crypto/adiantum.c
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@ -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)