From dfd818595b54942cb1adc45f6aed95c9b706e3a8 Mon Sep 17 00:00:00 2001
From: Amos Jeffries <yadij@users.noreply.github.com>
Date: Fri, 4 Sep 2020 17:38:30 +1200
Subject: [PATCH] Merge pull request from GHSA-jvf6-h9gj-pmj6

* Add slash prefix to path-rootless or path-noscheme URLs

* Update src/anyp/Uri.cc

Co-authored-by: Alex Rousskov <rousskov@measurement-factory.com>

* restore file trailer GH auto-removes

* Remove redundant path-empty check

* Removed stale comment left behind by b2ab59a

Many things imply a leading `/` in a URI. Their enumeration is likely to
(and did) become stale, misleading the reader.

* fixup: Remind that the `src` iterator may be at its end

We are dereferencing `src` without comparing it to `\0`.
To many readers that (incorrectly) implies that we are not done iterating yet.

Also fixed branch-added comment indentation.

Co-authored-by: Alex Rousskov <rousskov@measurement-factory.com>
---
 src/anyp/Uri.cc | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/src/anyp/Uri.cc b/src/anyp/Uri.cc
index 72dddb64aa..88fd83ee2d 100644
--- a/src/anyp/Uri.cc
+++ b/src/anyp/Uri.cc
@@ -343,8 +343,9 @@ AnyP::Uri::parse(const HttpRequestMethod& method, const SBuf &rawUrl)
                 return false;
             *dst = '\0';
 
-            // bug 3074: received 'path' starting with '?', '#', or '\0' implies '/'
-            if (*src == '?' || *src == '#' || *src == '\0') {
+            // We are looking at path-abempty.
+            if (*src != '/') {
+                // path-empty, including the end of the `src` c-string cases
                 urlpath[0] = '/';
                 dst = &urlpath[1];
             } else {
@@ -358,11 +359,6 @@ AnyP::Uri::parse(const HttpRequestMethod& method, const SBuf &rawUrl)
             /* We -could- be at the end of the buffer here */
             if (i > l)
                 return false;
-            /* If the URL path is empty we set it to be "/" */
-            if (dst == urlpath) {
-                *dst = '/';
-                ++dst;
-            }
             *dst = '\0';
 
             foundPort = scheme.defaultPort(); // may be reset later
