asfdec: add more checks for size left in asf packet buffer

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 1790096..c78a9de 100644 (file)
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -1141,7 +1141,7 @@ static int asf_read_replicated_data(AVFormatContext *s, ASFPacket *asf_pkt)
     if (!asf_pkt->data_size) {
         asf_pkt->data_size = asf_pkt->size_left = avio_rl32(pb); // read media object size
         if (asf_pkt->data_size <= 0)
-            return AVERROR_EOF;
+            return AVERROR_INVALIDDATA;
         if ((ret = av_new_packet(&asf_pkt->avpkt, asf_pkt->data_size)) < 0)
             return ret;
     } else
@@ -1190,6 +1190,8 @@ static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
             skip = pay_len - asf_pkt->size_left;
             pay_len = asf_pkt->size_left;
         }
+        if (asf_pkt->size_left <= 0)
+            return AVERROR_INVALIDDATA;
         if ((ret = avio_read(pb, p, pay_len)) < 0)
             return ret;
         if (s->key && s->keylen == 20)
@@ -1237,7 +1239,7 @@ static int asf_read_single_payload(AVFormatContext *s, AVPacket *pkt,
         return AVERROR_INVALIDDATA;
     }
     p = asf_pkt->avpkt.data + asf_pkt->data_size - asf_pkt->size_left;
-    if (size > asf_pkt->size_left)
+    if (size > asf_pkt->size_left || asf_pkt->size_left <= 0)
         return AVERROR_INVALIDDATA;
     if (asf_pkt->size_left > size)
         asf_pkt->size_left -= size;