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crypto: cbc - Ensure statesize is zero

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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: syzbot+050eeedd6c285d8c42f2@syzkaller.appspotmail.com
Fixes: 47309ea135 ("crypto: arc4 - Add internal state")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2024-01-29 22:17:11 +08:00
parent ccb88e9549
commit 69fba378ed
1 changed files with 3 additions and 0 deletions
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3
crypto/cbc.c
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@ -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)) if (!is_power_of_2(inst->alg.co.base.cra_blocksize))
goto out_free_inst; goto out_free_inst;
if (inst->alg.co.statesize)
goto out_free_inst;
inst->alg.encrypt = crypto_cbc_encrypt; inst->alg.encrypt = crypto_cbc_encrypt;
inst->alg.decrypt = crypto_cbc_decrypt; inst->alg.decrypt = crypto_cbc_decrypt;