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| author | Eric Biggers <ebiggers@google.com> | 2021-03-21 22:07:48 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2021-04-02 18:28:12 +1100 |
| commit | 30d0f6a956fc74bb2e948398daf3278c6b08c7e9 (patch) | |
| tree | ac74a11ccca1fc3a2c1e5c1ee3ec2ec132f65c95 /crypto | |
| parent | 10cb823bbacd2626cca8d89a7dba175c3ae5cf07 (diff) | |
| download | lwn-30d0f6a956fc74bb2e948398daf3278c6b08c7e9.tar.gz lwn-30d0f6a956fc74bb2e948398daf3278c6b08c7e9.zip | |
crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS
crypto_stats_get() is a no-op when the kernel is compiled without
CONFIG_CRYPTO_STATS, so pairing it with crypto_alg_put() unconditionally
(as crypto_rng_reset() does) is wrong.
Fix this by moving the call to crypto_stats_get() to just before the
actual algorithm operation which might need it. This makes it always
paired with crypto_stats_rng_seed().
Fixes: eed74b3eba9e ("crypto: rng - Fix a refcounting bug in crypto_rng_reset()")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/rng.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/crypto/rng.c b/crypto/rng.c index a888d84b524a..fea082b25fe4 100644 --- a/crypto/rng.c +++ b/crypto/rng.c @@ -34,22 +34,18 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) u8 *buf = NULL; int err; - crypto_stats_get(alg); if (!seed && slen) { buf = kmalloc(slen, GFP_KERNEL); - if (!buf) { - crypto_alg_put(alg); + if (!buf) return -ENOMEM; - } err = get_random_bytes_wait(buf, slen); - if (err) { - crypto_alg_put(alg); + if (err) goto out; - } seed = buf; } + crypto_stats_get(alg); err = crypto_rng_alg(tfm)->seed(tfm, seed, slen); crypto_stats_rng_seed(alg, err); out: |