Check texture ids are valid in CopyTextureCHROMIUM apis.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index b2f7f96963843b8f1843c07ea9003cb703ef25a9..34ddc02171a0ff5e89669900151afc3dc263bb35 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -12839,6 +12839,13 @@ void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
 
   TextureRef* source_texture_ref = GetTexture(source_id);
   TextureRef* dest_texture_ref = GetTexture(dest_id);
+
+  if (!source_texture_ref || !dest_texture_ref) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, "glCopySubTextureCHROMIUM",
+                       "unknown texture ids");
+    return;
+  }
+
   Texture* source_texture = source_texture_ref->texture();
   Texture* dest_texture = dest_texture_ref->texture();
   int source_width = 0;
@@ -12997,6 +13004,13 @@ void GLES2DecoderImpl::DoCopySubTextureCHROMIUM(
 
   TextureRef* source_texture_ref = GetTexture(source_id);
   TextureRef* dest_texture_ref = GetTexture(dest_id);
+
+  if (!source_texture_ref || !dest_texture_ref) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, "glCopySubTextureCHROMIUM",
+                       "unknown texture ids");
+    return;
+  }
+
   Texture* source_texture = source_texture_ref->texture();
   Texture* dest_texture = dest_texture_ref->texture();
   int source_width = 0;
@@ -13143,6 +13157,13 @@ void GLES2DecoderImpl::DoCompressedCopyTextureCHROMIUM(GLenum target,
 
   TextureRef* source_texture_ref = GetTexture(source_id);
   TextureRef* dest_texture_ref = GetTexture(dest_id);
+
+  if (!source_texture_ref || !dest_texture_ref) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, "glCompressedCopyTextureCHROMIUM",
+                       "unknown texture ids");
+    return;
+  }
+
   Texture* source_texture = source_texture_ref->texture();
   Texture* dest_texture = dest_texture_ref->texture();
   int source_width = 0;
@@ -13319,6 +13340,13 @@ void GLES2DecoderImpl::DoCompressedCopySubTextureCHROMIUM(GLenum target,
 
   TextureRef* source_texture_ref = GetTexture(source_id);
   TextureRef* dest_texture_ref = GetTexture(dest_id);
+
+  if (!source_texture_ref || !dest_texture_ref) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, "glCompressedCopySubTextureCHROMIUM",
+                       "unknown texture ids");
+    return;
+  }
+
   Texture* source_texture = source_texture_ref->texture();
   Texture* dest_texture = dest_texture_ref->texture();
   int source_width = 0;