Re: [FFmpeg-devel] [PATCH 3/4] avformat/mxfdec: Check for avio_read() failure in mxf_read_strong_ref_array()

[Marton Balint <cus@passwd.hu>]

On Sun, 13 Mar 2022, Michael Niedermayer wrote:

> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
> libavformat/mxfdec.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
> index d7cdd22c8a..828fc0f9f1 100644
> --- a/libavformat/mxfdec.c
> +++ b/libavformat/mxfdec.c
> @@ -932,6 +932,7 @@ static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, i
>
> static int mxf_read_strong_ref_array(AVIOContext *pb, UID **refs, int *count)
> {
> +    int64_t ret;
>     unsigned c = avio_rb32(pb);
>
>     //avio_read() used int
> @@ -946,7 +947,12 @@ static int mxf_read_strong_ref_array(AVIOContext *pb, UID **refs, int *count)
>         return AVERROR(ENOMEM);
>     }
>     avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
> -    avio_read(pb, (uint8_t *)*refs, *count * sizeof(UID));
> +    ret = avio_read(pb, (uint8_t *)*refs, *count * sizeof(UID));
> +    if (ret != *count * sizeof(UID)) {
> +        *count = ret < 0 ? 0   : ret / sizeof(UID);

I suggest you hard fail if the read count is not the expected, do not 
silently ignore corrupt file.

Regards,
Marton

> +        return   ret < 0 ? ret : AVERROR_INVALIDDATA;
> +    }
> +
>     return 0;
> }
>
> -- 
> 2.17.1
>
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