diff --git a/block.c b/block.c
index 5a0b421..ec3fa50 100644
--- a/block.c
+++ b/block.c
@@ -2690,6 +2690,10 @@
         .iov_len = nb_sectors * BDRV_SECTOR_SIZE,
     };
 
+    if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
+        return -EINVAL;
+    }
+
     qemu_iovec_init_external(&qiov, &iov, 1);
     return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS,
                         &qiov, is_write, flags);