pngenc: fix memory leak in error code path
Don't leak row_pointers if frame can't be mapped.
https://bugzilla.gnome.org/show_bug.cgi?id=787885
diff --git a/ext/libpng/gstpngenc.c b/ext/libpng/gstpngenc.c
index 3d3e116..e9050b1 100644
--- a/ext/libpng/gstpngenc.c
+++ b/ext/libpng/gstpngenc.c
@@ -304,7 +304,6 @@
png_set_write_fn (pngenc->png_struct_ptr, pngenc,
(png_rw_ptr) user_write_data, user_flush_data);
- row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
if (!gst_video_frame_map (&vframe, &pngenc->input_state->info,
frame->input_buffer, GST_MAP_READ)) {
GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
@@ -313,6 +312,8 @@
goto done;
}
+ row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
+
for (row_index = 0; row_index < GST_VIDEO_INFO_HEIGHT (info); row_index++) {
row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0) +
(row_index * GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0));