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commit 317b199b4aff8cfa27f2302ab404d2bb5032b9a4
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Tue Mar 29 12:57:56 2016 +0200
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CVE-2016-3075: Stack overflow in _nss_dns_getnetbyname_r [BZ #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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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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