From bc0e776c9aaf06f437bf21e05a713fd54dc85400 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 19 Sep 2020 20:48:38 +0200
Subject: [PATCH] avcodec/ansi: Check nb_args for overflow

Fixes: Integer overflow (no testcase)

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/ansi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/ansi.c b/libavcodec/ansi.c
index 516d07db69..272185230d 100644
--- a/libavcodec/ansi.c
+++ b/libavcodec/ansi.c
@@ -431,7 +431,8 @@ static int decode_frame(AVCodecContext *avctx,
                     s->args[s->nb_args] = FFMAX(s->args[s->nb_args], 0) * 10 + buf[0] - '0';
                 break;
             case ';':
-                s->nb_args++;
+                if (s->nb_args < MAX_NB_ARGS)
+                    s->nb_args++;
                 if (s->nb_args < MAX_NB_ARGS)
                     s->args[s->nb_args] = 0;
                 break;