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Fix NULL pointer dereference in SDL_RenderGeometryRaw with NPOT textures (thanks @bleeqer!)

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Fixes https://github.com/libsdl-org/SDL/issues/14329
Closes https://github.com/libsdl-org/SDL/pull/14331
This commit is contained in:
Sam Lantinga
2025-10-26 08:10:52 -07:00
parent 33f1008d01
commit 0ea20a5f86
1 changed files with 39 additions and 39 deletions
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78
src/render/SDL_render.c
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@@ -5291,8 +5291,8 @@ bool SDL_RenderGeometryRaw(SDL_Renderer *renderer,
{
int i;
int count = indices ? num_indices : num_vertices;
SDL_TextureAddressMode texture_address_mode_u;
SDL_TextureAddressMode texture_address_mode_v;
SDL_TextureAddressMode texture_address_mode_u = SDL_TEXTURE_ADDRESS_CLAMP;
SDL_TextureAddressMode texture_address_mode_v = SDL_TEXTURE_ADDRESS_CLAMP;
CHECK_RENDERER_MAGIC(renderer, false);
@@ -5354,47 +5354,47 @@ bool SDL_RenderGeometryRaw(SDL_Renderer *renderer,
if (texture->native) {
texture = texture->native;
}
}
if (renderer->npot_texture_wrap_unsupported && IsNPOT(texture->w)) {
texture_address_mode_u = SDL_TEXTURE_ADDRESS_CLAMP;
} else {
texture_address_mode_u = renderer->texture_address_mode_u;
}
if (renderer->npot_texture_wrap_unsupported && IsNPOT(texture->h)) {
texture_address_mode_v = SDL_TEXTURE_ADDRESS_CLAMP;
} else {
texture_address_mode_v = renderer->texture_address_mode_v;
}
if (texture &&
(texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO ||
texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO)) {
for (i = 0; i < num_vertices; ++i) {
const float *uv_ = (const float *)((const char *)uv + i * uv_stride);
float u = uv_[0];
float v = uv_[1];
if (u < 0.0f || u > 1.0f) {
if (texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_u = SDL_TEXTURE_ADDRESS_WRAP;
if (texture_address_mode_v != SDL_TEXTURE_ADDRESS_AUTO) {
break;
}
}
}
if (v < 0.0f || v > 1.0f) {
if (texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_v = SDL_TEXTURE_ADDRESS_WRAP;
if (texture_address_mode_u != SDL_TEXTURE_ADDRESS_AUTO) {
break;
}
}
}
}
if (texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO) {
if (renderer->npot_texture_wrap_unsupported && IsNPOT(texture->w)) {
texture_address_mode_u = SDL_TEXTURE_ADDRESS_CLAMP;
} else {
texture_address_mode_u = renderer->texture_address_mode_u;
}
if (texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO) {
if (renderer->npot_texture_wrap_unsupported && IsNPOT(texture->h)) {
texture_address_mode_v = SDL_TEXTURE_ADDRESS_CLAMP;
} else {
texture_address_mode_v = renderer->texture_address_mode_v;
}
if (texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO ||
texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO) {
for (i = 0; i < num_vertices; ++i) {
const float *uv_ = (const float *)((const char *)uv + i * uv_stride);
float u = uv_[0];
float v = uv_[1];
if (u < 0.0f || u > 1.0f) {
if (texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_u = SDL_TEXTURE_ADDRESS_WRAP;
if (texture_address_mode_v != SDL_TEXTURE_ADDRESS_AUTO) {
break;
}
}
}
if (v < 0.0f || v > 1.0f) {
if (texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_v = SDL_TEXTURE_ADDRESS_WRAP;
if (texture_address_mode_u != SDL_TEXTURE_ADDRESS_AUTO) {
break;
}
}
}
}
if (texture_address_mode_u == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_u = SDL_TEXTURE_ADDRESS_CLAMP;
}
if (texture_address_mode_v == SDL_TEXTURE_ADDRESS_AUTO) {
texture_address_mode_v = SDL_TEXTURE_ADDRESS_CLAMP;
}
}
}