From 55753fc712622744093c8050b779c3d830c427cb Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Thu, 8 Dec 2022 23:49:33 +0100
Subject: [PATCH] avcodec/mjpegdec: check that component linesize is always
 valid

---
 libavcodec/mjpegdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 9b7465abe7..228d3077b9 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1512,7 +1512,7 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
                                        "error y=%d x=%d\n", mb_y, mb_x);
                                 return AVERROR_INVALIDDATA;
                             }
-                            if (ptr) {
+                            if (ptr && linesize[c]) {
                                 s->idsp.idct_put(ptr, linesize[c], s->block);
                                 if (s->bits & 7)
                                     shift_output(s, ptr, linesize[c]);