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From 7f5b0778fa301b68c1c88e3820ec3afbd09dd0a5 Mon Sep 17 00:00:00 2001
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From: clanmills <robin@clanmills.com>
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Date: Wed, 27 Sep 2017 09:20:13 +0100
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Subject: Fix https://github.com/Exiv2/exiv2/issues/55
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(cherry picked from commit 6e3855aed7ba8bb4731fc4087ca7f9078b2f3d97)
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diff --git a/include/exiv2/value.hpp b/include/exiv2/value.hpp
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index 2078c6bd..b7d76fef 100644
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--- a/include/exiv2/value.hpp
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+++ b/include/exiv2/value.hpp
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@@ -1659,11 +1659,13 @@ 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 && INT_MIN < value_[n].first && value_[n].first < INT_MAX );
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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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@@ -1671,7 +1673,7 @@ 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 95589cd2..f2e1518b 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/error.cpp b/src/error.cpp
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index 80378c19..e90a9c0a 100644
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--- a/src/error.cpp
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+++ b/src/error.cpp
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@@ -106,6 +106,9 @@ namespace {
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{ 52, N_("%1 has invalid XMP value type `%2'") }, // %1=key, %2=value type
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{ 53, N_("Not a valid ICC Profile") },
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{ 54, N_("Not valid XMP") },
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+ { 55, N_("tiff directory length is too large") },
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+ { 56, N_("invalid type value detected in Image::printIFDStructure") },
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+ { 57, N_("invalid memory allocation request") },
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};
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}
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diff --git a/src/image.cpp b/src/image.cpp
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index 0d828045..ec5b873e 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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