28 lines
1,020 B
Diff
28 lines
1,020 B
Diff
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From 2959eda9272a033863c271aff62095abd01bd4e3 Mon Sep 17 00:00:00 2001
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From: Arjun Shankar <arjun.is@lostca.se>
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Date: Tue, 21 Apr 2015 14:06:31 +0200
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Subject: [PATCH] CVE-2015-1781: resolv/nss_dns/dns-host.c buffer overflow
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[BZ#18287]
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---
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ChangeLog | 6 ++++++
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NEWS | 9 ++++++++-
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resolv/nss_dns/dns-host.c | 3 ++-
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3 files changed, 16 insertions(+), 2 deletions(-)
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diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
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index b16b0dd..d8c5579 100644
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--- a/resolv/nss_dns/dns-host.c
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+++ b/resolv/nss_dns/dns-host.c
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@@ -615,7 +615,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
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int have_to_map = 0;
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uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);
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buffer += pad;
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- if (__glibc_unlikely (buflen < sizeof (struct host_data) + pad))
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+ buflen = buflen > pad ? buflen - pad : 0;
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+ if (__glibc_unlikely (buflen < sizeof (struct host_data)))
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{
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/* The buffer is too small. */
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too_small:
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