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| author | Stephan Mueller <smueller@chronox.de> | 2015-04-18 19:35:45 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-04-21 09:14:45 +0800 |
| commit | 082eb10ba97449a370e58f746522a4b90bcaee78 (patch) | |
| tree | 9b5c9dce71039eab77779297bdfa8f5e57a306fe /crypto/drbg.c | |
| parent | 04a34d4680e75e9be63204b3a7b51a6abe3ce35a (diff) | |
| download | lwn-082eb10ba97449a370e58f746522a4b90bcaee78.tar.gz lwn-082eb10ba97449a370e58f746522a4b90bcaee78.zip | |
crypto: drbg - fix drbg_generate return val check
The drbg_generate returns 0 in success case. That means that
drbg_generate_long will always only generate drbg_max_request_bytes at
most. Longer requests will be truncated to drbg_max_request_bytes.
Reported-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/drbg.c')
| -rw-r--r-- | crypto/drbg.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c index 8d2944fab8e8..5a218a5c9b9c 100644 --- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1442,19 +1442,19 @@ static int drbg_generate_long(struct drbg_state *drbg, unsigned char *buf, unsigned int buflen, struct drbg_string *addtl) { - int len = 0; + unsigned int len = 0; unsigned int slice = 0; do { - int tmplen = 0; + int err = 0; unsigned int chunk = 0; slice = ((buflen - len) / drbg_max_request_bytes(drbg)); chunk = slice ? drbg_max_request_bytes(drbg) : (buflen - len); - tmplen = drbg_generate(drbg, buf + len, chunk, addtl); - if (0 >= tmplen) - return tmplen; - len += tmplen; + err = drbg_generate(drbg, buf + len, chunk, addtl); + if (0 > err) + return err; + len += chunk; } while (slice > 0 && (len < buflen)); - return len; + return 0; } /* |