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

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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>
This commit is contained in:
Stephan Mueller 2014-07-31 21:47:33 +02:00 committed by Herbert Xu
parent 6391723293
commit ce5481d01f
1 changed files with 1 additions and 1 deletions
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2
crypto/drbg.c
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@ -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;
}