* [FFmpeg-devel] [PR] avcodec/mjpegdec: fix segfault on extern_huff and no extradata (PR #21519)
@ 2026-01-19 17:09 Ramiro Polla via ffmpeg-devel
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From: Ramiro Polla via ffmpeg-devel @ 2026-01-19 17:09 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: Ramiro Polla
PR #21519 opened by Ramiro Polla (ramiro)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21519
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21519.patch
Regression since 1debadd58e.
>From 7fbae1e8ad1cb46610f5a3f17bcb4830684026d5 Mon Sep 17 00:00:00 2001
From: Ramiro Polla <ramiro.polla@gmail.com>
Date: Mon, 19 Jan 2026 18:04:12 +0100
Subject: [PATCH] avcodec/mjpegdec: fix segfault on extern_huff and no
extradata
Regression since 1debadd58e.
---
libavcodec/mjpegdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 3af4b05551..c110130393 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -145,7 +145,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
if ((ret = init_default_huffman_tables(s)) < 0)
return ret;
- if (s->extern_huff) {
+ if (s->extern_huff && avctx->extradata) {
av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
bytestream2_init(&s->gB, avctx->extradata, avctx->extradata_size);
if (ff_mjpeg_decode_dht(s)) {
--
2.52.0
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2026-01-19 17:09 [FFmpeg-devel] [PR] avcodec/mjpegdec: fix segfault on extern_huff and no extradata (PR #21519) Ramiro Polla via ffmpeg-devel
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