curl: detect and bail out early on parameter integer overflows

Make the number parser aware of the maximum limit curl accepts for a
value and return an error immediately if larger, instead of running an
integer overflow later.

Fixes #1730
Closes #1736

1 files changed, 2 insertions, 0 deletions

diff --git a/src/tool_helpers.c b/src/tool_helpers.c
index 3d2dbe3ac..b3a9516a8 100644
--- a/src/tool_helpers.c
+++ b/src/tool_helpers.c
@@ -64,6 +64,8 @@ const char *param2text(int res)
     return "out of memory";
   case PARAM_NO_PREFIX:
     return "the given option can't be reversed with a --no- prefix";
+  case PARAM_NUMBER_TOO_LARGE:
+    return "too large number";
   default:
     return "unknown error";
   }