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🚑 fix for #407

pull/410/head
Niels Lohmann 2016-12-29 16:14:15 +01:00
parent 871cebaf84
commit 383a29a924
3 changed files with 33 additions and 0 deletions
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5
src/json.hpp
View File

@ -6981,6 +6981,7 @@ class basic_json
case 0xca: // float 32
{
// copy bytes in reverse order into the double variable
check_length(v.size(), sizeof(float), 1);
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
{
@ -6993,6 +6994,7 @@ class basic_json
case 0xcb: // float 64
{
// copy bytes in reverse order into the double variable
check_length(v.size(), sizeof(double), 1);
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)
{
@ -7558,6 +7560,7 @@ class basic_json
case 0xf9: // Half-Precision Float (two-byte IEEE 754)
{
check_length(v.size(), 2, 1);
idx += 2; // skip two content bytes
// code from RFC 7049, Appendix D, Figure 3:
@ -7589,6 +7592,7 @@ class basic_json
case 0xfa: // Single-Precision Float (four-byte IEEE 754)
{
// copy bytes in reverse order into the float variable
check_length(v.size(), sizeof(float), 1);
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
{
@ -7600,6 +7604,7 @@ class basic_json
case 0xfb: // Double-Precision Float (eight-byte IEEE 754)
{
check_length(v.size(), sizeof(double), 1);
// copy bytes in reverse order into the double variable
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)

5
src/json.hpp.re2c
View File

@ -6981,6 +6981,7 @@ class basic_json
case 0xca: // float 32
{
// copy bytes in reverse order into the double variable
check_length(v.size(), sizeof(float), 1);
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
{
@ -6993,6 +6994,7 @@ class basic_json
case 0xcb: // float 64
{
// copy bytes in reverse order into the double variable
check_length(v.size(), sizeof(double), 1);
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)
{
@ -7558,6 +7560,7 @@ class basic_json
case 0xf9: // Half-Precision Float (two-byte IEEE 754)
{
check_length(v.size(), 2, 1);
idx += 2; // skip two content bytes
// code from RFC 7049, Appendix D, Figure 3:
@ -7589,6 +7592,7 @@ class basic_json
case 0xfa: // Single-Precision Float (four-byte IEEE 754)
{
// copy bytes in reverse order into the float variable
check_length(v.size(), sizeof(float), 1);
float res;
for (size_t byte = 0; byte < sizeof(float); ++byte)
{
@ -7600,6 +7604,7 @@ class basic_json
case 0xfb: // Double-Precision Float (eight-byte IEEE 754)
{
check_length(v.size(), sizeof(double), 1);
// copy bytes in reverse order into the double variable
double res;
for (size_t byte = 0; byte < sizeof(double); ++byte)

23
test/src/unit-regression.cpp
View File

@ -547,4 +547,27 @@ TEST_CASE("regression tests")
std::vector<uint8_t> vec {0x65, 0xf5, 0x0a, 0x48, 0x21};
CHECK_THROWS_AS(json::from_cbor(vec), std::out_of_range);
}
SECTION("issue #407 - Heap-buffer-overflow (OSS-Fuzz issue 343)")
{
// original test case: incomplete float64
std::vector<uint8_t> vec1 {0xcb, 0x8f, 0x0a};
CHECK_THROWS_AS(json::from_msgpack(vec1), std::out_of_range);
// related test case: incomplete float32
std::vector<uint8_t> vec2 {0xca, 0x8f, 0x0a};
CHECK_THROWS_AS(json::from_msgpack(vec2), std::out_of_range);
// related test case: incomplete Half-Precision Float (CBOR)
std::vector<uint8_t> vec3 {0xf9, 0x8f};
CHECK_THROWS_AS(json::from_cbor(vec3), std::out_of_range);
// related test case: incomplete Single-Precision Float (CBOR)
std::vector<uint8_t> vec4 {0xfa, 0x8f, 0x0a};
CHECK_THROWS_AS(json::from_cbor(vec4), std::out_of_range);
// related test case: incomplete Double-Precision Float (CBOR)
std::vector<uint8_t> vec5 {0xfb, 0x8f, 0x0a};
CHECK_THROWS_AS(json::from_cbor(vec5), std::out_of_range);
}
}