--- a/gfx/wr/webrender/src/resource_cache.rs
+++ b/gfx/wr/webrender/src/resource_cache.rs
@@ -1211,18 +1211,19 @@ impl ResourceCache {
                 const MAX_TILES_PER_REQUEST: i32 = 512;
                 // For truly nonsensical requests, we might run into overflow
                 // when computing width * height, so we first check each extent
                 // individually.
                 while !tiles.size.is_empty_or_negative()
                     && (tiles.size.width > MAX_TILES_PER_REQUEST
                         || tiles.size.height > MAX_TILES_PER_REQUEST
                         || tiles.size.width * tiles.size.height > MAX_TILES_PER_REQUEST) {
-                    let w = tiles.size.width;
-                    let h = tiles.size.height;
+                    let limit = 46340; // sqrt(i32::MAX) rounded down to avoid overflow.
+                    let w = tiles.size.width.min(limit);
+                    let h = tiles.size.height.min(limit);
                     let diff = w * h - MAX_TILES_PER_REQUEST;
                     // Remove tiles in the largest dimension.
                     if tiles.size.width > tiles.size.height {
                         tiles.size.width -= diff / h + 1;
                         tiles.origin.x += diff / (2 * h);
                     } else {
                         tiles.size.height -= diff / w + 1;
                         tiles.origin.y += diff / (2 * w);