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diff --git a/include/exiv2/value.hpp b/include/exiv2/value.hpp
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index 64a8ca7..4e9f285 100644
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--- a/include/exiv2/value.hpp
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+++ b/include/exiv2/value.hpp
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@@ -1658,11 +1658,13 @@ namespace Exiv2 {
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ok_ = true;
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return static_cast<long>(value_[n]);
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}
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+// #55 crash when value_[n].first == LONG_MIN
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+#define LARGE_INT 1000000
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// Specialization for rational
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template<>
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inline long ValueType<Rational>::toLong(long n) const
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{
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- ok_ = (value_[n].second != 0);
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+ ok_ = (value_[n].second != 0 && -LARGE_INT < value_[n].first && value_[n].first < LARGE_INT);
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if (!ok_) return 0;
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return value_[n].first / value_[n].second;
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}
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@@ -1670,7 +1672,7 @@ namespace Exiv2 {
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template<>
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inline long ValueType<URational>::toLong(long n) const
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{
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- ok_ = (value_[n].second != 0);
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+ ok_ = (value_[n].second != 0 && value_[n].first < LARGE_INT);
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if (!ok_) return 0;
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return value_[n].first / value_[n].second;
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}
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diff --git a/src/basicio.cpp b/src/basicio.cpp
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index 1ede931..eac756f 100644
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--- a/src/basicio.cpp
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+++ b/src/basicio.cpp
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@@ -990,6 +990,7 @@ namespace Exiv2 {
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DataBuf FileIo::read(long rcount)
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{
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assert(p_->fp_ != 0);
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+ if ( (size_t) rcount > size() ) throw Error(57);
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DataBuf buf(rcount);
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long readCount = read(buf.pData_, buf.size_);
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buf.size_ = readCount;
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diff --git a/src/image.cpp b/src/image.cpp
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index 31b9b81..eeb1f37 100644
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--- a/src/image.cpp
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+++ b/src/image.cpp
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@@ -399,7 +399,13 @@ namespace Exiv2 {
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;
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// if ( offset > io.size() ) offset = 0; // Denial of service?
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- DataBuf buf(size*count + pad+20); // allocate a buffer
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+
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+ // #55 memory allocation crash test/data/POC8
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+ long long allocate = (long long) size*count + pad+20;
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+ if ( allocate > (long long) io.size() ) {
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+ throw Error(57);
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+ }
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+ DataBuf buf(allocate); // allocate a buffer
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std::memcpy(buf.pData_,dir.pData_+8,4); // copy dir[8:11] into buffer (short strings)
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if ( count*size > 4 ) { // read into buffer
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size_t restore = io.tell(); // save
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