nut: Make sure to clean up on read_header failure

Based on Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> work.

CC: libav-stable@libav.org

libavformat/nutdec.c

@@ -682,6 +682,20 @@ fail:
     return ret;
 }
 
+static int nut_read_close(AVFormatContext *s)
+{
+    NUTContext *nut = s->priv_data;
+    int i;
+
+    av_freep(&nut->time_base);
+    av_freep(&nut->stream);
+    ff_nut_free_sp(nut);
+    for (i = 1; i < nut->header_count; i++)
+        av_freep(&nut->header[i]);
+
+    return 0;
+}
+
 static int nut_read_header(AVFormatContext *s)
 {
     NUTContext *nut = s->priv_data;
@@ -697,7 +711,7 @@ static int nut_read_header(AVFormatContext *s)
         pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
         if (pos < 0 + 1) {
             av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
-            return AVERROR_INVALIDDATA;
+            goto fail;
         }
     } while (decode_main_header(nut) < 0);
 
@@ -707,7 +721,7 @@ static int nut_read_header(AVFormatContext *s)
         pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
         if (pos < 0 + 1) {
             av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
-            return AVERROR_INVALIDDATA;
+            goto fail;
         }
         if (decode_stream_header(nut) >= 0)
             initialized_stream_count++;
@@ -721,7 +735,7 @@ static int nut_read_header(AVFormatContext *s)
 
         if (startcode == 0) {
             av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
-            return AVERROR_INVALIDDATA;
+            goto fail;
         } else if (startcode == SYNCPOINT_STARTCODE) {
             nut->next_startcode = startcode;
             break;
@@ -744,6 +758,11 @@ static int nut_read_header(AVFormatContext *s)
     ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
 
     return 0;
+
+fail:
+    nut_read_close(s);
+
+    return AVERROR_INVALIDDATA;
 }
 
 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
@@ -1018,20 +1037,6 @@ static int read_seek(AVFormatContext *s, int stream_index,
     return 0;
 }
 
-static int nut_read_close(AVFormatContext *s)
-{
-    NUTContext *nut = s->priv_data;
-    int i;
-
-    av_freep(&nut->time_base);
-    av_freep(&nut->stream);
-    ff_nut_free_sp(nut);
-    for (i = 1; i < nut->header_count; i++)
-        av_freep(&nut->header[i]);
-
-    return 0;
-}
-
 AVInputFormat ff_nut_demuxer = {
     .name           = "nut",
     .long_name      = NULL_IF_CONFIG_SMALL("NUT"),