From: Lucy Phipps <landfillbaby69@gmail.com>
Date: Wed, 8 Jun 2022 17:48:19 +0000 (+0100)
Subject: early return as requested
X-Git-Tag: 2.1.0-beta1~202
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c17bd0a5f3af4f52851e24beebfee2f0d5fc907;p=thirdparty%2Fzlib-ng.git

early return as requested
---

diff --git a/arch/arm/crc32_acle.c b/arch/arm/crc32_acle.c
index 0133e88fb..ce75c343e 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);