egldevice: add EGLDevice checking helper function

This is useful to ensure EGLDevices given to functions (such as
eglQueryDeviceAttrib or eglQueryDeviceString) are valid.

Signed-off-by: Jonny Lamb <jonny.lamb@collabora.co.uk>

3 files changed, 36 insertions, 0 deletions

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 98589d9822..b87bac8e6d 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -157,6 +157,12 @@
 #define _EGL_CHECK_SYNC(disp, s, ret, drv) \
    _EGL_CHECK_OBJECT(disp, Sync, s, ret, drv)
 
+#define _EGL_CHECK_DEVICE(dev, ret, devptr)                     \
+   do {                                                         \
+      devptr = _eglLookupDevice(dev);                           \
+      if (!devptr)                                              \
+         RETURN_EGL_ERROR(NULL, EGL_BAD_DEVICE_EXT, ret);       \
+   } while (0)
 
 static inline _EGLDriver *
 _eglCheckDisplay(_EGLDisplay *disp, const char *msg)
diff --git a/src/egl/main/egldevice.c b/src/egl/main/egldevice.c
index 9307b56e48..33473df620 100644
--- a/src/egl/main/egldevice.c
+++ b/src/egl/main/egldevice.c
@@ -89,6 +89,32 @@ out:
    return info;
 }
 
+/**
+ * Lookup an existing device in the device list.
+ * Return NULL if the device pointer doesn't already exist in the device list.
+ */
+_EGLDevice *
+_eglLookupDevice(EGLDeviceEXT device)
+{
+   _EGLDeviceInfo *info;
+   _EGLDevice *dev;
+
+   info = _eglEnsureDeviceInfo(EGL_FALSE);
+   if (!info)
+      return NULL;
+
+   mtx_lock(_eglGlobal.Mutex);
+
+   for (dev = info->devices; dev; dev = dev->Next) {
+      if (dev == device)
+         break;
+   }
+
+   mtx_unlock(_eglGlobal.Mutex);
+
+   return dev;
+}
+
 /* TODO: this is all copied from loader.c. it should probably be put somewhere
  * common so both there and here can use the same source. also, if it remains
  * here, it needs a mutex.*/
diff --git a/src/egl/main/egldevice.h b/src/egl/main/egldevice.h
index 682f4b1c3c..5ea2df8286 100644
--- a/src/egl/main/egldevice.h
+++ b/src/egl/main/egldevice.h
@@ -44,6 +44,10 @@ extern void
 _eglFiniDeviceInfo(void);
 
 
+_EGLDevice *
+_eglLookupDevice(EGLDeviceEXT device);
+
+
 EGLBoolean
 _eglQueryDevicesEXT(EGLint max_devices, _EGLDevice **devices,
                     EGLint *num_devices);