From 3ed23e423bf758678dcbd906e22d54f9e95b5f10 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Sun, 12 Dec 2021 23:39:02 +0100
Subject: Add pedantic WebP dimensions overflow checking

---
 fastiv-io.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fastiv-io.c b/fastiv-io.c
index 1dc04be..6362598 100644
--- a/fastiv-io.c
+++ b/fastiv-io.c
@@ -1212,8 +1212,13 @@ load_libwebp_animated(const WebPData *wd, GError **error)
 	WebPAnimDecoder *dec = WebPAnimDecoderNew(wd, &options);
 	WebPAnimDecoderGetInfo(dec, &info);
 
-	int last_timestamp = 0;
 	cairo_surface_t *frames = NULL, *frames_tail = NULL;
+	if (info.canvas_width > INT_MAX || info.canvas_height > INT_MAX) {
+		set_error(error, "image dimensions overflow");
+		goto fail;
+	}
+
+	int last_timestamp = 0;
 	while (WebPAnimDecoderHasMoreFrames(dec)) {
 		cairo_surface_t *surface =
 			load_libwebp_frame(dec, &info, &last_timestamp, error);
-- 
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