path: root/crypto
diff options
authorEric Biggers <ebiggers@google.com>2021-03-21 22:07:48 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2021-04-02 18:28:12 +1100
commit30d0f6a956fc74bb2e948398daf3278c6b08c7e9 (patch)
treeac74a11ccca1fc3a2c1e5c1ee3ec2ec132f65c95 /crypto
parent10cb823bbacd2626cca8d89a7dba175c3ae5cf07 (diff)
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')
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);

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