details: https://hg.nginx.org/nginx/rev/7f702d35ac38
branches: stable-1.20
changeset: 7858:7f702d35ac38
user: Maxim Dounin <mdounin@mdounin.ru>
date: Tue May 25 15:17:36 2021 +0300
description:
Resolver: fixed off-by-one write in ngx_resolver_copy().

Reported by Luis Merino, Markus Vervier, Eric Sesterhenn, X41 D-Sec GmbH.

diffstat:

src/core/ngx_resolver.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diffs (23 lines):

diff -r 76871d1340ea -r 7f702d35ac38 src/core/ngx_resolver.c
--- a/src/core/ngx_resolver.c Tue May 25 15:29:54 2021 +0300
+++ b/src/core/ngx_resolver.c Tue May 25 15:17:36 2021 +0300
@@ -4008,15 +4008,15 @@ done:
n = *src++;

} else {
+ if (dst != name->data) {
+ *dst++ = '.';
+ }
+
ngx_strlow(dst, src, n);
dst += n;
src += n;

n = *src++;
-
- if (n != 0) {
- *dst++ = '.';
- }
}

if (n == 0) {
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