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[client] opengl: validate framebuffer uploads

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This commit is contained in:
Geoffrey McRae
2026-08-24 13:14:32 +10:00
parent 50b7ca603a
commit 56ea0cfaba
1 changed files with 46 additions and 2 deletions
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48
client/renderers/OpenGL/opengl.c
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@@ -131,6 +131,7 @@ struct Inst
GLuint dataFormat;
size_t texSize;
size_t texPos;
bool texUploadError;
float scaleX, scaleY;
const FrameBuffer * frame;
LG_RendererFrameToken pendingFrameToken;
@@ -1313,6 +1314,14 @@ static bool opengl_bufferFn(void * opaque, const void * data, size_t size)
{
struct Inst * this = (struct Inst *)opaque;
if (this->texPos > this->texSize || size > this->texSize - this->texPos)
{
this->texUploadError = true;
DEBUG_ERROR("Texture upload exceeds its buffer (%zu + %zu > %zu)",
this->texPos, size, this->texSize);
return false;
}
// update the buffer, this performs a DMA transfer if possible
g_gl_dynProcs.glBufferSubData(
GL_PIXEL_UNPACK_BUFFER,
@@ -1322,7 +1331,10 @@ static bool opengl_bufferFn(void * opaque, const void * data, size_t size)
);
if (check_gl_error("glBufferSubData"))
{
this->texUploadError = true;
return false;
}
this->texPos += size;
return true;
@@ -1384,8 +1396,12 @@ static bool drawFrame(struct Inst * this,
glPixelStorei(GL_UNPACK_ALIGNMENT , bpp < 4 ? 1 : bpp);
glPixelStorei(GL_UNPACK_ROW_LENGTH, this->format.frameWidth);
this->texPos = 0;
framebuffer_read_fn(
this->texPos = 0;
this->texUploadError = false;
const size_t expectedSize =
(size_t)this->format.dataHeight *
(size_t)this->format.dataWidth * (size_t)bpp;
const bool readComplete = framebuffer_read_fn(
frame,
this->format.dataHeight,
this->format.dataWidth,
@@ -1395,8 +1411,31 @@ static bool drawFrame(struct Inst * this,
this
);
const bool incomplete = !readComplete || this->texPos != expectedSize;
const bool fatal = this->texUploadError ||
(readComplete && this->texPos != expectedSize);
if (incomplete && !fatal)
{
this->frame = frame;
this->pendingFrameToken = pendingFrameToken;
this->frameRelease = release;
atomic_store_explicit(&this->frameUpdate, true, memory_order_release);
}
LG_UNLOCK(this->frameLock);
if (incomplete)
{
g_gl_dynProcs.glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
LG_UNLOCK(this->formatLock);
if (fatal)
invokeFrameRelease(release);
DEBUG_WARN("%s incomplete texture upload (%zu of %zu bytes)",
fatal ? "Rejecting" : "Retrying", this->texPos, expectedSize);
return !fatal;
}
// update the texture
glTexSubImage2D(
GL_TEXTURE_2D,
@@ -1423,6 +1462,11 @@ static bool drawFrame(struct Inst * this,
this->vboFormat,
this->texSize
);
g_gl_dynProcs.glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
LG_UNLOCK(this->formatLock);
invokeFrameRelease(release);
return false;
}
// unbind the buffer