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avcodec/ansi: Check nb_args for overflow

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Fixes: Integer overflow (no testcase)

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit bc0e776c9a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-19 20:48:38 +02:00
parent 124a433d15
commit f4d75810b4
1 changed files with 2 additions and 1 deletions
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3
libavcodec/ansi.c
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@ -430,7 +430,8 @@ static int decode_frame(AVCodecContext *avctx,
s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0'; s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
break; break;
case ';': case ';':
s->nb_args++; if (s->nb_args < MAX_NB_ARGS)
s->nb_args++;
if (s->nb_args < MAX_NB_ARGS) if (s->nb_args < MAX_NB_ARGS)
s->args[s->nb_args] = 0; s->args[s->nb_args] = 0;
break; break;