[FFmpeg-devel] [PATCH 6/6] avfilter/vf_drawtext: do not overread text if the last UTF8 sequence is invalid

[Paul B Mahol]

lgtm

On 1/30/20, Marton Balint <cus at passwd.hu> wrote:
> Signed-off-by: Marton Balint <cus at passwd.hu>
> ---
>  libavfilter/vf_drawtext.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
> index ed10175af0..b58556e0f1 100644
> --- a/libavfilter/vf_drawtext.c
> +++ b/libavfilter/vf_drawtext.c
> @@ -1225,7 +1225,7 @@ static int draw_glyphs(DrawTextContext *s, AVFrame
> *frame,
>      for (i = 0, p = text; *p; i++) {
>          FT_Bitmap bitmap;
>          Glyph dummy = { 0 };
> -        GET_UTF8(code, *p++, code = 0xfffd; goto continue_on_invalid;);
> +        GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto
> continue_on_invalid;);
>  continue_on_invalid:
>
>          /* skip new line chars, just go to new line */
> @@ -1364,7 +1364,7 @@ static int draw_text(AVFilterContext *ctx, AVFrame
> *frame,
>
>      /* load and cache glyphs */
>      for (i = 0, p = text; *p; i++) {
> -        GET_UTF8(code, *p++, code = 0xfffd; goto continue_on_invalid;);
> +        GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto
> continue_on_invalid;);
>  continue_on_invalid:
>
>          /* get glyph */
> @@ -1388,7 +1388,7 @@ continue_on_invalid:
>      /* compute and save position for each glyph */
>      glyph = NULL;
>      for (i = 0, p = text; *p; i++) {
> -        GET_UTF8(code, *p++, code = 0xfffd; goto continue_on_invalid2;);
> +        GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto
> continue_on_invalid2;);
>  continue_on_invalid2:
>
>          /* skip the \n in the sequence \r\n */
> --
> 2.16.4
>
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