[FFmpeg-devel] [PATCH 1/4] avcodec/jpegxl_parser: ensure input padding is zeroed

[Leo Izen]

On 6/26/24 8:40 PM, Kacper Michajłow wrote:
> Fixes use of uninitialized value, reported by MSAN.
> 
> Found by OSS-Fuzz.
> 
> Signed-off-by: Kacper Michajłow <kasper93 at gmail.com>
> ---
>   libavcodec/jpegxl_parser.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c
> index 8c45e1a1b7..f833f844c4 100644
> --- a/libavcodec/jpegxl_parser.c
> +++ b/libavcodec/jpegxl_parser.c
> @@ -1419,6 +1419,7 @@ static int try_parse(AVCodecParserContext *s, AVCodecContext *avctx, JXLParseCon
>           }
>           cs_buffer = ctx->cs_buffer;
>           cs_buflen = FFMIN(sizeof(ctx->cs_buffer) - AV_INPUT_BUFFER_PADDING_SIZE, ctx->copied);
> +        memset(ctx->cs_buffer + cs_buflen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
>       } else {
>           cs_buffer = buf;
>           cs_buflen = buf_size;

This one looks fine. Per the other comments on the other jxl patch, I 
think that one is unnecessary, but this one is fine.

I have no comment on the generic patches.

- Leo Izen (Traneptora)