From ae509f8f0804dea0eea89e27329014616c9d4cc0 Mon Sep 17 00:00:00 2001
From: Kamil Turek <kamil.turek@hotmail.com>
Date: Fri, 16 Sep 2022 21:43:12 +0200
Subject: [PATCH] Fixed #34014 -- Fixed DecimalValidator validating 0 in
 positive exponent scientific notation.

Thanks Shiplu Mokaddim for the report.
---
 django/core/validators.py | 6 ++++--
 tests/validators/tests.py | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/django/core/validators.py b/django/core/validators.py
index 473203a67e..c73490588d 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -486,8 +486,10 @@ class DecimalValidator:
                 self.messages["invalid"], code="invalid", params={"value": value}
             )
         if exponent >= 0:
-            # A positive exponent adds that many trailing zeros.
-            digits = len(digit_tuple) + exponent
+            digits = len(digit_tuple)
+            if digit_tuple != (0,):
+                # A positive exponent adds that many trailing zeros.
+                digits += exponent
             decimals = 0
         else:
             # If the absolute value of the negative exponent is larger than the
diff --git a/tests/validators/tests.py b/tests/validators/tests.py
index f9ffdfd605..02bee30ac1 100644
--- a/tests/validators/tests.py
+++ b/tests/validators/tests.py
@@ -548,6 +548,7 @@ TEST_DATA = [
         Decimal("70E-6"),
         ValidationError,
     ),
+    (DecimalValidator(max_digits=2, decimal_places=1), Decimal("0E+1"), None),
     # 'Enter a number.' errors
     *[
         (