From d42cb1925987cc27899441ce39fa7bd2647dc72e Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 3 Nov 2026 04:46:19 +0100
Subject: [PATCH] avcodec/sanm: apply the codec 23 LUT loaded from the frame

Fixes: 4dmaFsb0C0KW
Fixes: AISLE-2026-0150-00882
Fixes: use of uninitialized memory
Use of uninitialized memory Replicated through UnModified FFmpeg with MSAN

Found-by: Joshua Rogers (AISLE)
---
 libavcodec/sanm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index 749d003a1b..041466b210 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -797,6 +797,7 @@ static int old_codec23(SANMVideoContext *ctx, GetByteContext *gb, int top, int l
         if (bytestream2_get_bytes_left(gb) < 256)
             return AVERROR_INVALIDDATA;
         bytestream2_get_bufferu(gb, ctx->c23lut, 256);
+        memcpy(lut, ctx->c23lut, 256);
     } else if (param2 < 256) {
         for (i = 0; i < 256; i++)
             lut[i] = (i + param2) & 0xff;