From 16bdc09ee01c8041cde3e7f1f11de17f5a6c27b0 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 8 Sep 2023 18:13:14 +0200
Subject: [PATCH] http_aws_sigv4: skip the op if the query pair is zero bytes

Follow-up to fc76a24c53b08cdf

Spotted by OSS-Fuzz

Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=62175
Closes #11823
---
 lib/http_aws_sigv4.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/http_aws_sigv4.c b/lib/http_aws_sigv4.c
index f62820207b..050ce21c9e 100644
--- a/lib/http_aws_sigv4.c
+++ b/lib/http_aws_sigv4.c
@@ -422,6 +422,8 @@ static CURLcode canon_query(struct Curl_easy *data,
   for(i = 0; !result && (i < entry); i++, ap++) {
     size_t len;
     const char *q = ap->p;
+    if(!ap->len)
+      continue;
     for(len = ap->len; len && !result; q++, len--) {
       if(ISALNUM(*q))
         result = Curl_dyn_addn(dq, q, 1);
-- 
2.47.3