Commit 69fba378 authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: cbc - Ensure statesize is zero 



The cbc template should not be applied on stream ciphers, especially
ones that have internal state.  Enforce this by checking the state
size when the instance is created.

Reported-by: default avatar <syzbot+050eeedd6c285d8c42f2@syzkaller.appspotmail.com>
Fixes: 47309ea1 ("crypto: arc4 - Add internal state")
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ccb88e95

crypto/cbc.c

+3 −0
Original line number Diff line number Diff line
@@ -148,6 +148,9 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb) 
	if (!is_power_of_2(inst->alg.co.base.cra_blocksize))

		goto out_free_inst;



	if (inst->alg.co.statesize)

		goto out_free_inst;



	inst->alg.encrypt = crypto_cbc_encrypt;

	inst->alg.decrypt = crypto_cbc_decrypt;