From fd7352660be0211aabb11dc6d586836515772f81 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 16 Apr 2023 15:24:16 +0200 Subject: [PATCH] avcodec/flacdec: Fix signed integre overflow Fixes: signed integer overflow: 3011809745540902265 + 6323452730883571725 cannot be represented in type 'long' Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLAC_fuzzer-6687553022722048 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/flacdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c index cc778a8dff..524a046949 100644 --- a/libavcodec/flacdec.c +++ b/libavcodec/flacdec.c @@ -513,7 +513,7 @@ static int decode_subframe_lpc_33bps(FLACContext *s, int64_t *decoded, for (i = pred_order; i < s->blocksize; i++, decoded++) { int64_t sum = 0; for (j = 0; j < pred_order; j++) - sum += (int64_t)coeffs[j] * decoded[j]; + sum += (int64_t)coeffs[j] * (uint64_t)decoded[j]; decoded[j] = residual[i] + (sum >> qlevel); }