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-rw-r--r--libavformat/dsfdec.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/libavformat/dsfdec.c b/libavformat/dsfdec.c
index e0485f1492..5e06fd63a5 100644
--- a/libavformat/dsfdec.c
+++ b/libavformat/dsfdec.c
@@ -137,8 +137,8 @@ static int dsf_read_header(AVFormatContext *s)
dsf->data_end = avio_tell(pb);
if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
return AVERROR_INVALIDDATA;
- dsf->data_size = avio_rl64(pb);
- dsf->data_end += dsf->data_size;
+ dsf->data_size = avio_rl64(pb) - 12;
+ dsf->data_end += dsf->data_size + 12;
s->internal->data_offset = avio_tell(pb);
return 0;