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-rw-r--r--crypto/ansi_cprng.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
index ffa0245e2abc..6ddd99e6114b 100644
--- a/crypto/ansi_cprng.c
+++ b/crypto/ansi_cprng.c
@@ -414,10 +414,18 @@ static int fips_cprng_get_random(struct crypto_rng *tfm, u8 *rdata,
static int fips_cprng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
{
u8 rdata[DEFAULT_BLK_SZ];
+ u8 *key = seed + DEFAULT_BLK_SZ;
int rc;
struct prng_context *prng = crypto_rng_ctx(tfm);
+ if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
+ return -EINVAL;
+
+ /* fips strictly requires seed != key */
+ if (!memcmp(seed, key, DEFAULT_PRNG_KSZ))
+ return -EINVAL;
+
rc = cprng_reset(tfm, seed, slen);
if (!rc)