avcodec/flac_parser: Fix infinite loop
authorMichael Niedermayer <michael@niedermayer.cc>
Mon, 30 Apr 2018 20:20:28 +0000 (22:20 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Mon, 16 Jul 2018 17:06:26 +0000 (19:06 +0200)
Fixes: crbug/827204

Reported-by: Frank Liberato <liberato@google.com>
Reviewed-by: Frank Liberato <liberato@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 15a2e35e9e74bba5a27e39c26da5be2361f27945)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/flac_parser.c

index 84da23f..2721286 100644 (file)
@@ -686,12 +686,17 @@ static int flac_parse(AVCodecParserContext *s, AVCodecContext *avctx,
     }
 
     for (curr = fpc->headers; curr; curr = curr->next) {
-        if (curr->max_score > 0 &&
-            (!fpc->best_header || curr->max_score > fpc->best_header->max_score)) {
+        if (!fpc->best_header || curr->max_score > fpc->best_header->max_score) {
             fpc->best_header = curr;
         }
     }
 
+    if (fpc->best_header && fpc->best_header->max_score <= 0) {
+        // Only accept a bad header if there is no other option to continue
+        if (!buf_size || !buf || read_end != buf || fpc->nb_headers_buffered < FLAC_MIN_HEADERS)
+            fpc->best_header = NULL;
+    }
+
     if (fpc->best_header) {
         fpc->best_header_valid = 1;
         if (fpc->best_header->offset > 0) {