From 7734c583f777fdba2f6463cf525385ebe5cf10db Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 11 Jul 2024 22:13:42 +0200 Subject: [PATCH] avformat/webpenc: Check filesize in trailer not sure this is possible Fixes: CID1604446 Overflowed constant Sponsored-by: Sovereign Tech Fund Signed-off-by: Michael Niedermayer --- libavformat/webpenc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/webpenc.c b/libavformat/webpenc.c index 1c5b93e0ab..ce0d046aa9 100644 --- a/libavformat/webpenc.c +++ b/libavformat/webpenc.c @@ -190,7 +190,7 @@ static int webp_write_trailer(AVFormatContext *s) if (!ret) { filesize = avio_tell(s->pb); - if (avio_seek(s->pb, 4, SEEK_SET) == 4) { + if (filesize >= 8 && avio_seek(s->pb, 4, SEEK_SET) == 4) { avio_wl32(s->pb, filesize - 8); // Note: without the following, avio only writes 8 bytes to the file. avio_seek(s->pb, filesize, SEEK_SET);