* [PATCH] DRBG: fix failure of generating multiple of 2**16 bytes
@ 2014-07-31 19:47 Stephan Mueller
2014-08-01 14:41 ` Herbert Xu
0 siblings, 1 reply; 2+ messages in thread
From: Stephan Mueller @ 2014-07-31 19:47 UTC (permalink / raw)
To: herbert; +Cc: linux-kernel, linux-crypto
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>
---
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
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2014-07-31 19:47 [PATCH] DRBG: fix failure of generating multiple of 2**16 bytes Stephan Mueller
2014-08-01 14:41 ` Herbert Xu
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