An out-of-bounds write vulnerability was found to be caused by not checking errors in BN_bn2dec(). If an oversize BIGNUM is presented to BN_bn2dec() it can cause BN_div_word() to fail and not reduce the value of 't' resulting in OOB writes to the bn_data buffer and eventually crashing. https://bugzilla.redhat.com/show_bug.cgi?id=1367340
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