[FFmpeg-devel] [PATCH] clear s->error in avio_read

Fredrik Hubinette hubbe at google.com
Mon Mar 20 19:21:08 EET 2017

In some cases (when parsing OGG) non-fatal errors can happen, which
will cause s->error to be set. In most cases, this is not a problem beucase
s->error is not checked unless an actual error has occurred.  However,
when avio_read() fails to read more bytes, it checks s->error to decide if
it just reached the end of the file, or an error occurred. Since s->error is
not modified if no error occurred, this is not reliable unless we first
s->error before reading.

 libavformat/aviobuf.c   | 2 ++

 2 files changed, 7 insertions(+)

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c

index bf7e5f85a0..35ca3a3b4f 100644

--- a/libavformat/aviobuf.c

+++ b/libavformat/aviobuf.c

@@ -605,6 +605,8 @@ int avio_read(AVIOContext *s, unsigned char *buf, int

     int len, size1;

+    s->error = 0;


     size1 = size;

     while (size > 0) {

         len = FFMIN(s->buf_end - s->buf_ptr, size);


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