44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
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From 146b58d11fddbef15b888906e3be4f33900c416f Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Tue, 29 Mar 2016 12:57:56 +0200
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Subject: [PATCH] CVE-2016-3075: Stack overflow in _nss_dns_getnetbyname_r [BZ
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#19879]
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The defensive copy is not needed because the name may not alias the
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output buffer.
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(cherry picked from commit 317b199b4aff8cfa27f2302ab404d2bb5032b9a4)
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(cherry picked from commit 883dceebc8f11921a9890211a4e202e5be17562f)
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---
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ChangeLog | 7 +++++++
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NEWS | 10 ++++++++--
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resolv/nss_dns/dns-network.c | 5 +----
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3 files changed, 16 insertions(+), 6 deletions(-)
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diff --git a/resolv/nss_dns/dns-network.c b/resolv/nss_dns/dns-network.c
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index 2eb2f67..8f301a7 100644
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--- a/resolv/nss_dns/dns-network.c
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+++ b/resolv/nss_dns/dns-network.c
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@@ -118,17 +118,14 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
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} net_buffer;
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querybuf *orig_net_buffer;
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int anslen;
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- char *qbuf;
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enum nss_status status;
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if (__res_maybe_init (&_res, 0) == -1)
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return NSS_STATUS_UNAVAIL;
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- qbuf = strdupa (name);
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-
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net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
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- anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
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+ anslen = __libc_res_nsearch (&_res, name, C_IN, T_PTR, net_buffer.buf->buf,
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1024, &net_buffer.ptr, NULL, NULL, NULL, NULL);
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if (anslen < 0)
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{
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--
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2.9.3
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