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Workaround for BN_bn2mpi reading/writing out of bounds

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When OpenSSL's BN_bn2mpi is passed a buffer of size 4, valgrind
reports reading/writing one byte past it. I am unable to find
evidence of this behaviour in BN_bn2mpi's source code, so it may
be a spurious warning. However, this change is harmless, as only
the bignum with value 0 results in an mpi serialization of size 4.
This commit is contained in:
Pieter Wuille 2012-02-18 13:32:25 +01:00
parent 39231e9105
commit a06113b0c5
1 changed files with 1 additions and 1 deletions
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2
src/bignum.h
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@ -243,7 +243,7 @@ public:
std::vector<unsigned char> getvch() const std::vector<unsigned char> getvch() const
{ {
unsigned int nSize = BN_bn2mpi(this, NULL); unsigned int nSize = BN_bn2mpi(this, NULL);
if (nSize < 4) if (nSize <= 4)
return std::vector<unsigned char>(); return std::vector<unsigned char>();
std::vector<unsigned char> vch(nSize); std::vector<unsigned char> vch(nSize);
BN_bn2mpi(this, &vch[0]); BN_bn2mpi(this, &vch[0]);