drm: fix oops on reading proc file with no master

diff --git a/linux-core/drm_proc.c b/linux-core/drm_proc.c
index b6748b9..7f18520 100644 (file)
--- a/linux-core/drm_proc.c
+++ b/linux-core/drm_proc.c
@@ -175,6 +175,9 @@ static int drm_name_info(char *buf, char **start, off_t offset, int request,
                return 0;
        }
 
+       if (!master)
+               return 0;
+
        *start = &buf[offset];
        *eof = 0;