1 files changed, 4 insertions, 1 deletions
diff --git a/qemu-img.c b/qemu-img.c
index 37d1afb839..df3aefd35a 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -371,12 +371,15 @@ static int add_old_style_options(const char *fmt, QemuOpts *opts,
 static int64_t cvtnum(const char *s)
 {
     int err;
-    int64_t value;
+    uint64_t value;
 
     err = qemu_strtosz(s, NULL, &value);
     if (err < 0) {
         return err;
     }
+    if (value > INT64_MAX) {
+        return -ERANGE;
+    }
     return value;
 }