Signed-off-by: Marton Balint <c...@passwd.hu>
---
libavformat/aviobuf.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 9675425349..aa1d6c0830 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -999,9 +999,12 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
int filled = s->buf_end - s->buffer;
ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr -
s->buffer : -1;
- buf_size += s->buf_ptr - s->buffer + max_buffer_size;
+ if (buf_size <= s->buf_end - s->buf_ptr)
+ return 0;
+
+ buf_size += s->buf_ptr - s->buffer + max_buffer_size - 1;
- if (buf_size < filled || s->seekable || !s->read_packet)
+ if (buf_size <= s->buffer_size || s->seekable || !s->read_packet)
return 0;
av_assert0(!s->write_flag);
--
2.26.2
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