1 files changed, 3 insertions, 0 deletions
diff --git a/regexec.c b/regexec.c
index f765024766..0f5d6fbee3 100644
--- a/regexec.c
+++ b/regexec.c
@@ -3652,6 +3652,9 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
 			*that* much linear. */
 		if (!PL_reg_maxiter) {
 		    PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4);
+		    /* possible overflow for long strings and many CURLYX's */
+		    if (PL_reg_maxiter < 0)
+			PL_reg_maxiter = I32_MAX;
 		    PL_reg_leftiter = PL_reg_maxiter;
 		}
 		if (PL_reg_leftiter-- == 0) {