crypto: drbg - fix failure of generating multiple of 2**16 bytes

The function drbg_generate_long slices the request into 2**16 byte
or smaller chunks. However, the loop, however invokes the random number
generation function with zero bytes when the request size is a multiple
of 2**16 bytes. The fix prevents zero bytes requests.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/drbg.c b/crypto/drbg.c
index ff975d9e0c2a..7894db9ca90b 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1500,7 +1500,7 @@ static int drbg_generate_long(struct drbg_state *drbg,
                 if (0 >= tmplen)
                         return tmplen;
                 len += tmplen;
-        } while (slice > 0);
+        } while (slice > 0 && (len < buflen));
         return len;
 }