diff options
| -rw-r--r-- | crypto/bn/bn_lib.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c index 4fe6ce071a..9d665c26fc 100644 --- a/crypto/bn/bn_lib.c +++ b/crypto/bn/bn_lib.c @@ -447,6 +447,15 @@ static BIGNUM *bin2bn(const unsigned char *s, int len, BIGNUM *ret, bn_check_top(ret); /* + * If the input has no bits, the number is considered zero. + * This makes calls with s==NULL and len==0 safe. + */ + if (len == 0) { + BN_clear(ret); + return ret; + } + + /* * The loop that does the work iterates from least to most * significant BIGNUM chunk, so we adapt parameters to transfer * input bytes accordingly. |