[Mesa-dev] [PATCH 01/11] mesa: Returns a GL_INVALID_VALUE error on several glGet* APIs when max length is negative

[Eduardo Lima Mitev]

The manual page for glGetAttachedShaders, glGetShaderSource, glGetActiveUniform and
glGetActiveUniform state that a GL_INVALID_VALUE is returned if the maximum length
argument is less than zero. For reference, see:
https://www.opengl.org/sdk/docs/man3/xhtml/glGetAttachedShaders.xml,
https://www.khronos.org/opengles/sdk/docs/man31/html/glGetAttachedShaders.xhtml,
https://www.opengl.org/sdk/docs/man3/xhtml/glGetShaderSource.xml,
https://www.khronos.org/opengles/sdk/docs/man31/html/glGetShaderSource.xhtml,
https://www.opengl.org/sdk/docs/man3/xhtml/glGetActiveUniform.xml,
https://www.khronos.org/opengles/sdk/docs/man31/html/glGetActiveUniform.xhtml,
https://www.opengl.org/sdk/docs/man3/xhtml/glGetActiveAttrib.xml,
https://www.khronos.org/opengles/sdk/docs/man31/html/glGetActiveAttrib.xhtml.

This fixes 4 dEQP test:
* dEQP-GLES3.functional.negative_api.state.get_attached_shaders
* dEQP-GLES3.functional.negative_api.state.get_shader_source
* dEQP-GLES3.functional.negative_api.state.get_active_uniform
* dEQP-GLES3.functional.negative_api.state.get_active_attrib
---
 src/mesa/main/shader_query.cpp  |  5 +++++
 src/mesa/main/shaderapi.c       | 10 ++++++++++
 src/mesa/main/uniform_query.cpp |  5 +++++
 3 files changed, 20 insertions(+)

diff --git a/src/mesa/main/shader_query.cpp b/src/mesa/main/shader_query.cpp
index 766ad29..df9081b 100644
--- a/src/mesa/main/shader_query.cpp
+++ b/src/mesa/main/shader_query.cpp
@@ -109,6 +109,11 @@ _mesa_GetActiveAttrib(GLhandleARB program, GLuint desired_index,
    GET_CURRENT_CONTEXT(ctx);
    struct gl_shader_program *shProg;
 
+   if (maxLength < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(maxLength < 0)");
+      return;
+   }
+
    shProg = _mesa_lookup_shader_program_err(ctx, program, "glGetActiveAttrib");
    if (!shProg)
       return;
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 118e8a7..0449514 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -450,6 +450,12 @@ get_attached_shaders(struct gl_context *ctx, GLuint program, GLsizei maxCount,
 {
    struct gl_shader_program *shProg =
       _mesa_lookup_shader_program_err(ctx, program, "glGetAttachedShaders");
+
+   if (maxCount < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGetAttachedShaders(maxCount < 0)");
+      return;
+   }
+
    if (shProg) {
       GLuint i;
       for (i = 0; i < (GLuint) maxCount && i < shProg->NumShaders; i++) {
@@ -786,6 +792,10 @@ get_shader_source(struct gl_context *ctx, GLuint shader, GLsizei maxLength,
                   GLsizei *length, GLchar *sourceOut)
 {
    struct gl_shader *sh;
+   if (maxLength < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGetShaderSource(bufSize < 0)");
+      return;
+   }
    sh = _mesa_lookup_shader_err(ctx, shader, "glGetShaderSource");
    if (!sh) {
       return;
diff --git a/src/mesa/main/uniform_query.cpp b/src/mesa/main/uniform_query.cpp
index 32870d0..5cedc9c 100644
--- a/src/mesa/main/uniform_query.cpp
+++ b/src/mesa/main/uniform_query.cpp
@@ -51,6 +51,11 @@ _mesa_GetActiveUniform(GLuint program, GLuint index,
    if (!shProg)
       return;
 
+   if (maxLength < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveUniform(maxLength < 0)");
+      return;
+   }
+
    if (index >= shProg->NumUserUniformStorage) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveUniform(index)");
       return;
-- 
2.1.3