[Mesa-dev] [PATCH] mesa: return early with no error when shader source count is 0

[Bartosz Tomczyk]

malloc can return valid pointer for zero size allocation,
which causes OOB access later on
---
 src/mesa/main/shaderapi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index c41f006eb7..36cff0ca6e 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1776,6 +1776,9 @@ _mesa_ShaderSource(GLuint shaderObj, GLsizei count,
    GLcharARB *source;
    struct gl_shader *sh;
 
+   if (!count)
+      return;
+
    sh = _mesa_lookup_shader_err(ctx, shaderObj, "glShaderSourceARB");
    if (!sh)
       return;
-- 
2.12.2