mesa: check for bufSize > 0 in _mesa_GetSynciv()

The spec doesn't say GL_INVALID_VALUE should be raised for bufSize <= 0.
In any case, memcpy(len < 0) will lead to a crash, so don't allow it.

CC: "9.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/mesa/main/syncobj.c b/src/mesa/main/syncobj.c
index 27867a13775b615d8ff56cda7253e4546366538e..ad21f3b670ab3fb9a21127f7e08d93a206204aec 100644 (file)
--- a/src/mesa/main/syncobj.c
+++ b/src/mesa/main/syncobj.c
@@ -418,7 +418,7 @@ _mesa_GetSynciv(GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length,
       return;
    }
 
-   if (size > 0) {
+   if (size > 0 && bufSize > 0) {
       const GLsizei copy_count = MIN2(size, bufSize);
 
       memcpy(values, v, sizeof(GLint) * copy_count);