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avcodec/lcldec: Fixes uqvq overflow

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Fixes: integer overflow
Fixes: 490241717/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ZLIB_DEC_fuzzer-4560518961758208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7241b80422)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-03-07 13:41:38 +01:00
parent 711b69c615
commit c88ae59e31
1 changed files with 2 additions and 2 deletions
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4
libavcodec/lcldec.c
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@@ -175,7 +175,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
int height = avctx->height; // Real image height
unsigned int mszh_dlen;
unsigned char yq, y1q, uq, vq;
int uqvq, ret;
int ret;
unsigned int mthread_inlen, mthread_outlen;
unsigned int len = buf_size;
int linesize, offset;
@@ -306,7 +306,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 3;
yq = encoded[pixel_ptr++];
uqvq = AV_RL16(encoded+pixel_ptr);
unsigned uqvq = AV_RL16(encoded+pixel_ptr);
pixel_ptr += 2;
for (col = 1; col < width; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];