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nss_dns: In gaih_getanswer_slice, skip strange aliases (bug 12154)

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If the name is not a host name, skip adding it to the result, instead
of reporting query failure.  This fixes bug 12154 for getaddrinfo.

This commit still keeps the old parsing code, and only adjusts when
a host name is copied.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2022-08-30 10:02:49 +02:00
parent d101d836e7
commit 32b599ac8c
1 changed files with 4 additions and 4 deletions
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8
resolv/nss_dns/dns-host.c
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@@ -970,12 +970,12 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
n = -1;
}
if (__glibc_unlikely (n < 0 || __libc_res_hnok (buffer) == 0))
if (__glibc_unlikely (n < 0))
{
++had_error;
continue;
}
if (*firstp && canon == NULL)
if (*firstp && canon == NULL && __libc_res_hnok (buffer))
{
h_name = buffer;
buffer += h_namelen;
@@ -1021,14 +1021,14 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
n = __libc_dn_expand (answer->buf, end_of_message, cp,
tbuf, sizeof tbuf);
if (__glibc_unlikely (n < 0 || __libc_res_hnok (tbuf) == 0))
if (__glibc_unlikely (n < 0))
{
++had_error;
continue;
}
cp += n;
if (*firstp)
if (*firstp && __libc_res_hnok (tbuf))
{
/* Reclaim buffer space. */
if (h_name + h_namelen == buffer)