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Message-ID: <7159935.MYAcUzQ1Ny@myon.chronox.de> Date: Thu, 31 Jul 2014 21:47:33 +0200 From: Stephan Mueller <smueller@...onox.de> To: herbert@...dor.apana.org.au Cc: linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org Subject: [PATCH] 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@...onox.de> --- crypto/drbg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/drbg.c b/crypto/drbg.c index ff975d9..7894db9 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; } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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