[FFmpeg-devel] [PATCH] asfdec: division by 0 on missing packet size
Reimar Döffinger
Reimar.Doeffinger
Thu Jul 2 14:35:44 CEST 2009
Hello,
AFAICT there is no way to demux ASF without knowing the packet size,
thus read_header should already fail instead of crashing at read_packet
when we try to calulate modulus the packet size.
"Fixes" wmv7/smclockv7.wmv.1.0 from issue1240.
Index: libavformat/asfdec.c
===================================================================
--- libavformat/asfdec.c (revision 19325)
+++ libavformat/asfdec.c (working copy)
@@ -535,6 +535,10 @@
url_fseek(pb, gsize - 24, SEEK_CUR);
}
}
+ if (s->packet_size <= 0) {
+ av_log(s, AV_LOG_FATAL, "Invalid packet size, can not demux!\n");
+ return -1;
+ }
get_guid(pb, &g);
get_le64(pb);
get_byte(pb);
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