diff --git a/libavfilter/af_firequalizer.c b/libavfilter/af_firequalizer.c
index f14983b431..63ac308365 100644
--- a/libavfilter/af_firequalizer.c
+++ b/libavfilter/af_firequalizer.c
@@ -728,6 +728,7 @@ static int config_input(AVFilterLink *inlink)
     FilterLink *l = ff_filter_link(inlink);
     AVFilterContext *ctx = inlink->dst;
     FIREqualizerContext *s = ctx->priv;
+    const double delay_samples = inlink->sample_rate * s->delay;
     float iscale, scale = 1.f;
     int rdft_bits, ret;
 
@@ -736,7 +737,11 @@ static int config_input(AVFilterLink *inlink)
     s->next_pts = 0;
     s->frame_nsamples_max = 0;
 
-    s->fir_len = FFMAX(2 * (int)(inlink->sample_rate * s->delay) + 1, 3);
+    if (!isfinite(delay_samples) || delay_samples >= (INT_MAX + 1.0) / 2) {
+        av_log(ctx, AV_LOG_ERROR, "too large or non-finite delay, please decrease it.\n");
+        return AVERROR(EINVAL);
+    }
+    s->fir_len = FFMAX(2 * (int)delay_samples + 1, 3);
     s->remaining = s->fir_len - 1;
 
     for (rdft_bits = RDFT_BITS_MIN; rdft_bits <= RDFT_BITS_MAX; rdft_bits++) {