lavd/opengl_enc: check strings before parsing them.

Fix a segfault if OpenGL was not initialized before calling
write_header().

diff --git a/libavdevice/opengl_enc.c b/libavdevice/opengl_enc.c
index fa94345a7c895a3b6e0a956cc755ddda78e673c2..b07f9c2e431257c9e437293abba9120ff2222798 100644 (file)
--- a/libavdevice/opengl_enc.c
+++ b/libavdevice/opengl_enc.c
@@ -588,6 +588,10 @@ static av_cold int opengl_read_limits(AVFormatContext *h)
 
     version = glGetString(GL_VERSION);
     extensions = glGetString(GL_EXTENSIONS);
+    if (!version || !extensions) {
+        av_log(h, AV_LOG_ERROR, "No OpenGL context initialized for the current thread\n");
+        return AVERROR(ENOSYS);
+    }
 
     av_log(h, AV_LOG_DEBUG, "OpenGL version: %s\n", version);
     sscanf(version, "%d.%d", &major, &minor);