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avformat/aviobuf: Do not resize the buffer in ffio_ensure_seekback() if there is no read function 

Without a read function there can never be more data read than the buffer could
hold

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-04-27 04:52:01 +02:00
parent 0ace686ae8
commit 46778ab212
1 changed files with 1 additions and 1 deletions
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2
libavformat/aviobuf.c
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@ -805,7 +805,7 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
buf_size += s->buf_ptr - s->buffer + max_buffer_size;
if (buf_size < filled || s->seekable)
if (buf_size < filled || s->seekable || !s->read_packet)
return 0;
av_assert0(!s->write_flag);