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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-02-18 20:33:55 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-02-18 21:20:06 +0800 |
| commit | b170a137f467ea951c3f256da1b911545acf3ffd (patch) | |
| tree | b8f65dc4e1b5b6cd9bb144698c7007b7483a7c80 /crypto/ablkcipher.c | |
| parent | 3f683d6175748ef9daf4698d9ef5a488dd037063 (diff) | |
| download | lwn-b170a137f467ea951c3f256da1b911545acf3ffd.tar.gz lwn-b170a137f467ea951c3f256da1b911545acf3ffd.zip | |
crypto: skcipher - Avoid infinite loop when cipher fails selftest
When an skcipher constructed through crypto_givcipher_default fails
its selftest, we'll loop forever trying to construct new skcipher
objects but failing because it already exists.
The crux of the issue is that once a givcipher fails the selftest,
we'll ignore it on the next run through crypto_skcipher_lookup and
attempt to construct a new givcipher.
We should instead return an error to the caller if we find a
givcipher that has failed the test.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ablkcipher.c')
| -rw-r--r-- | crypto/ablkcipher.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c index 94140b3756fc..e11ce37c7104 100644 --- a/crypto/ablkcipher.c +++ b/crypto/ablkcipher.c @@ -282,6 +282,25 @@ static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, alg->cra_ablkcipher.ivsize)) return alg; + crypto_mod_put(alg); + alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, + mask & ~CRYPTO_ALG_TESTED); + if (IS_ERR(alg)) + return alg; + + if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == + CRYPTO_ALG_TYPE_GIVCIPHER) { + if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { + crypto_mod_put(alg); + alg = ERR_PTR(-ENOENT); + } + return alg; + } + + BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == + CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : + alg->cra_ablkcipher.ivsize)); + return ERR_PTR(crypto_givcipher_default(alg, type, mask)); } |