[FFmpeg-devel] [PATCH 3/4] avcodec/sanm: Check w, h for subversion < 2

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 3/4] avcodec/sanm: Check w, h for subversion < 2
Date: Thu, 19 Jun 2025 05:04:30 +0200
Message-ID: <20250619030432.2977718-3-michael@niedermayer.cc> (raw)
In-Reply-To: <20250619030432.2977718-1-michael@niedermayer.cc>

Fixes: 410609432/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SANM_fuzzer-4935159201988608
Fixes: out of array access

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/sanm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index 642ef02bff2..02bb78859a8 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -1670,6 +1670,8 @@ static int process_frame_obj(SANMVideoContext *ctx, GetByteContext *gb)
             /* Rebel Assault 1: 384x242 internal size */
             xres = 384;
             yres = 242;
+            if (w > xres || h > yres)
+                return AVERROR_INVALIDDATA;
             ctx->have_dimensions = 1;
         } else if (codec == 37 || codec == 47 || codec == 48) {
             /* these codecs work on full frames, trust their dimensions */
-- 
2.49.0

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