From 9c17bd0a5f3af4f52851e24beebfee2f0d5fc907 Mon Sep 17 00:00:00 2001
From: Lucy Phipps <landfillbaby69@gmail.com>
Date: Wed, 8 Jun 2022 18:48:19 +0100
Subject: [PATCH] early return as requested

---
 arch/arm/crc32_acle.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/crc32_acle.c b/arch/arm/crc32_acle.c
index 0133e88f..ce75c343 100644
--- a/arch/arm/crc32_acle.c
+++ b/arch/arm/crc32_acle.c
@@ -37,6 +37,11 @@ uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, uint64_t len) {
         len -= sizeof(uint32_t);
     }
 
+    if (len == 0) {
+        c = ~c;
+        return c;
+    }
+
     const uint64_t *buf8 = (const uint64_t *) buf4;
 
     while (len >= sizeof(uint64_t)) {
@@ -61,6 +66,11 @@ uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, uint64_t len) {
     buf = (const unsigned char *) buf2;
 #else /* __aarch64__ */
 
+    if (len == 0) {
+        c = ~c;
+        return c;
+    }
+
     while (len >= sizeof(uint32_t)) {
         c = __crc32w(c, *buf4++);
         len -= sizeof(uint32_t);
-- 
2.47.3