Check the MPEG version ID for the reserved bit pattern 01, and abort the
header check in that case. This reduces the chance of misinterpreting
arbitrary data as a valid header, and prevents resulting audio artifacts.
---
libavcodec/mpegaudiodecheader.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/mpegaudiodecheader.h b/libavcodec/mpegaudiodecheader.h
index 1cb9216461..ed9961250a 100644
--- a/libavcodec/mpegaudiodecheader.h
+++ b/libavcodec/mpegaudiodecheader.h
@@ -62,6 +62,9 @@ static inline int ff_mpa_check_header(uint32_t header){
/* header */
if ((header & 0xffe00000) != 0xffe00000)
return -1;
+ /* version check */
+ if ((header & (3<<19)) == 1)
+ return -1;
/* layer check */
if ((header & (3<<17)) == 0)
return -1;
--
2.14.3 (Apple Git-98)
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