[FFmpeg-cvslog] avcodec/qdrw: adjust max colors to array size

[Michael Niedermayer]

ffmpeg | branch: release/5.0 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jul  3 00:43:21 2022 +0200| [0ba8bf701144a480e1ffe03881db255f6b129400] | committer: Michael Niedermayer

avcodec/qdrw: adjust max colors to array size

Fixes: out of array access
Fixes: 48429/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDRAW_fuzzer-4608329791438848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cd847f86d31f87f0f7733ca6ab7a2c022a1398bd)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0ba8bf701144a480e1ffe03881db255f6b129400
---

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

diff --git a/libavcodec/qdrw.c b/libavcodec/qdrw.c
index fcc1de0c62..3721ba25ee 100644
--- a/libavcodec/qdrw.c
+++ b/libavcodec/qdrw.c
@@ -369,7 +369,7 @@ static int decode_frame(AVCodecContext *avctx,
             bytestream2_skip(&gbc, 18);
             colors = bytestream2_get_be16(&gbc);
 
-            if (colors < 0 || colors > 256) {
+            if (colors < 0 || colors > 255) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Error color count - %i(0x%X)\n", colors, colors);
                 return AVERROR_INVALIDDATA;