From: Alexey Izbyshev <izbyshev@ispras.ru>
Date: Sat, 25 Feb 2023 15:41:32 +0000 (+0300)
Subject: fix potential read past end of buffer in getnameinfo host name lookup
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=523d9b965df65bd3ad52863abc817724d7a35f32;hp=d0b7f9768df133428b6587a5273551c56c46d6a6;p=musl

fix potential read past end of buffer in getnameinfo host name lookup

This is completely analoguous to commit 633183b5d1c2.

Similar code called from __lookup_name is not affected because it checks
that the line contains the host name surrounded by blanks.
---

diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c
index 080d3c06..7abe0fa9 100644
--- a/src/network/getnameinfo.c
+++ b/src/network/getnameinfo.c
@@ -58,6 +58,7 @@ static void reverse_hosts(char *buf, const unsigned char *a, unsigned scopeid, i
 		if ((p=strchr(line, '#'))) *p++='\n', *p=0;
 
 		for (p=line; *p && !isspace(*p); p++);
+		if (!*p) continue;
 		*p++ = 0;
 		if (__lookup_ipliteral(&iplit, line, AF_UNSPEC)<=0)
 			continue;