X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Felectronicarts.c;h=3070b05780e52e78143206e4bfa57c298ca7682a;hb=c0b47d1914a19abacdf1edf081cbf07485952920;hp=0fb66970d609ecfaf99c4fa075af1adf3c7123c6;hpb=41a097aada4d45bddb492bb47d64e67423001775;p=ffmpeg

diff --git a/libavformat/electronicarts.c b/libavformat/electronicarts.c
index 0fb66970d60..3070b05780e 100644
--- a/libavformat/electronicarts.c
+++ b/libavformat/electronicarts.c
@@ -495,12 +495,17 @@ static int ea_read_packet(AVFormatContext *s,
 
     while (!packet_read || partial_packet) {
         chunk_type = avio_rl32(pb);
-        chunk_size = (ea->big_endian ? avio_rb32(pb) : avio_rl32(pb)) - 8;
+        chunk_size = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
+        if (chunk_size <= 8)
+            return AVERROR_INVALIDDATA;
+        chunk_size -= 8;
 
         switch (chunk_type) {
         /* audio data */
         case ISNh_TAG:
             /* header chunk also contains data; skip over the header portion*/
+            if (chunk_size < 32)
+                return AVERROR_INVALIDDATA;
             avio_skip(pb, 32);
             chunk_size -= 32;
         case ISNd_TAG: