[FFmpeg-devel] [PATCH] avcodec/exr: Handle axmax like bxmin in 04d7a6d3db56ea1a93908ff2d3d312e3fc40a58c (PR #20879)

[michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #20879 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20879
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20879.patch

Fixes: out of array access
Fixes: 418335931/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_DEC_fuzzer-6718455383654400

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>


>From f14110ac5d9d7deff51c5bdcdd38eace991fc199 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 9 Nov 2025 16:39:45 +0100
Subject: [PATCH] avcodec/exr: Handle axmax like bxmin in
 04d7a6d3db56ea1a93908ff2d3d312e3fc40a58c

Fixes: out of array access
Fixes: 418335931/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_DEC_fuzzer-6718455383654400

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/exr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index 536a55c5be..ca450a988e 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -1485,7 +1485,8 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
                 }
 
                 // Zero out the end if xmax+1 is not w
-                memset(ptr_x, 0, axmax);
+                if (s->desc->flags & AV_PIX_FMT_FLAG_PLANAR || !c)
+                    memset(ptr_x, 0, axmax);
                 channel_buffer[c] += td->channel_line_size;
             }
         }
-- 
2.49.1

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