egl: move Null check to eglGetSyncAttribKHR to prevent Segfault

Null-check on "*value" is currently done in _eglGetSyncAttrib, which is
after eglGetSyncAttribKHR dereferences it.

Move the check a layer up (in the beginning of eglGetSyncAttribKHR) to
avoid segfaults.

Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
[Emil Velikov: tweak commit message, add stable tag]
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 323634e..32f6823 100644 (file)
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -1555,8 +1555,14 @@ eglGetSyncAttrib(EGLDisplay dpy, EGLSync sync, EGLint attribute, EGLAttrib *valu
 static EGLBoolean EGLAPIENTRY
 eglGetSyncAttribKHR(EGLDisplay dpy, EGLSync sync, EGLint attribute, EGLint *value)
 {
-   EGLAttrib attrib = *value;
-   EGLBoolean result = eglGetSyncAttrib(dpy, sync, attribute, &attrib);
+   EGLAttrib attrib;
+   EGLBoolean result;
+
+   if (!value)
+      RETURN_EGL_ERROR(NULL, EGL_BAD_PARAMETER, EGL_FALSE);
+
+   attrib = *value;
+   result = eglGetSyncAttrib(dpy, sync, attribute, &attrib);
 
    /* The EGL_KHR_fence_sync spec says this about eglGetSyncAttribKHR:
     *

diff --git a/src/egl/main/eglsync.c b/src/egl/main/eglsync.c
index 3019e6e..999cb48 100644 (file)
--- a/src/egl/main/eglsync.c
+++ b/src/egl/main/eglsync.c
@@ -144,9 +144,6 @@ EGLBoolean
 _eglGetSyncAttrib(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSync *sync,
                   EGLint attribute, EGLAttrib *value)
 {
-   if (!value)
-      return _eglError(EGL_BAD_PARAMETER, "eglGetSyncAttribKHR");
-
    switch (attribute) {
    case EGL_SYNC_TYPE_KHR:
       *value = sync->Type;