[FFmpeg-cvslog] avformat/evcdec: Check that enough data has been read

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Thu Jul  6 22:48:55 2023 +0200| [e5ab2dab2c73710c753bf8a44171fc747625e9f3] | committer: Andreas Rheinhardt

avformat/evcdec: Check that enough data has been read

Fixes potential use of uninitialized values
in evc_read_nal_unit_length().

Reviewed-by: James Almer <jamrial at gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e5ab2dab2c73710c753bf8a44171fc747625e9f3
---

 libavformat/evcdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/evcdec.c b/libavformat/evcdec.c
index 9e09f8d264..6cce174f46 100644
--- a/libavformat/evcdec.c
+++ b/libavformat/evcdec.c
@@ -162,6 +162,8 @@ static int evc_read_packet(AVFormatContext *s, AVPacket *pkt)
         ret = avio_read(s->pb, buf, EVC_NALU_LENGTH_PREFIX_SIZE);
         if (ret < 0)
             return ret;
+        if (ret != EVC_NALU_LENGTH_PREFIX_SIZE)
+            return AVERROR_INVALIDDATA;
 
         nalu_size = evc_read_nal_unit_length(buf, EVC_NALU_LENGTH_PREFIX_SIZE);
         if (!nalu_size || nalu_size > INT_MAX)