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Verify GLTF indices to prevent crash with corrupt files

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Also verify prior to vertex optimization.
This commit is contained in:
lawnjelly 2024-07-31 10:14:34 +01:00 committed by Relintai
parent 82d3a7204b
commit 08f4960b23
4 changed files with 33 additions and 0 deletions
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14
core/math/geometry.cpp
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@ -1860,3 +1860,17 @@ void Geometry::sort_polygon_winding(Vector<Vector2> &r_verts, bool p_clockwise)
r_verts.invert();
}
}
bool Geometry::verify_indices(const int *p_indices, int p_num_indices, int p_num_vertices) {
ERR_FAIL_NULL_V(p_indices, false);
ERR_FAIL_COND_V(p_num_indices < 0, false);
ERR_FAIL_COND_V(p_num_vertices < 0, false);
for (int n = 0; n < p_num_indices; n++) {
if ((unsigned int)p_indices[n] >= (unsigned int)p_num_vertices) {
return false;
}
}
return true;
}

1
core/math/geometry.h
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@ -1057,6 +1057,7 @@ public:
static Vector<Vector3> compute_convex_mesh_points(const Plane *p_planes, int p_plane_count, real_t p_epsilon = CMP_EPSILON);
static bool convex_hull_intersects_convex_hull(const Plane *p_planes_a, int p_plane_count_a, const Plane *p_planes_b, int p_plane_count_b);
static real_t calculate_convex_hull_volume(const Geometry::MeshData &p_md);
static bool verify_indices(const int *p_indices, int p_num_indices, int p_num_vertices);
static _FORCE_INLINE_ Vector<Point2i> bresenham_line(int x0, int x1, int y0, int y1) {
Vector<Point2i> points;

4
core/math/vertex_cache_optimizer.cpp
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@ -31,6 +31,7 @@
#include "vertex_cache_optimizer.h"
#include "core/math/geometry.h"
#include "core/math/math_funcs.h"
// Precalculate the tables.
@ -288,6 +289,9 @@ bool VertexCacheOptimizer::reorder_indices_pool(PoolVector<int> &r_indices, uint
}
bool VertexCacheOptimizer::reorder_indices(LocalVector<int> &r_indices, uint32_t p_num_triangles, uint32_t p_num_verts) {
// If the mesh contains invalid indices, abort.
ERR_FAIL_COND_V(!Geometry::verify_indices(r_indices.ptr(), r_indices.size(), p_num_verts), false);
LocalVector<int> temp;
temp.resize(r_indices.size());
if (_reorder_indices((VERTEX_INDEX_TYPE *)temp.ptr(), (VERTEX_INDEX_TYPE *)r_indices.ptr(), p_num_triangles, p_num_verts)) {

14
editor_modules/gltf/gltf_document.cpp
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@ -2959,6 +2959,20 @@ Error GLTFDocument::_parse_meshes(Ref<GLTFState> p_state) {
mat = mat3d;
}
int32_t mat_idx = import_mesh->get_surface_count();
// Check for invalid indices.
if (array[Mesh::ARRAY_INDEX] && array[Mesh::ARRAY_INDEX] != Variant()) {
const Vector<int> &inds = array[Mesh::ARRAY_INDEX];
if (array[Mesh::ARRAY_VERTEX] && array[Mesh::ARRAY_VERTEX] != Variant()) {
const Vector<Vector3> &vertices = array[Mesh::ARRAY_VERTEX];
int num_verts = vertices.size();
// The mesh contains invalid indices, abort.
ERR_FAIL_COND_V(!Geometry::verify_indices(inds.ptr(), inds.size(), num_verts), ERR_FILE_CORRUPT);
}
}
import_mesh->add_surface_from_arrays(primitive, array, morphs, p_state->compress_flags);
import_mesh->surface_set_material(mat_idx, mat);
}