37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
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From eb1d8c8289f466ba3ad10b9a88ab2e426b8a9dc7 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Tue, 6 Apr 2010 09:55:19 +0200
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Subject: [PATCH] Fix use-after-free bug in __dns_lookup
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If the type of the first answer does not match with the requested type,
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then the dotted name was freed. If there are no further answers in
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the DNS reply, this pointer was used later on in the same function.
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Additionally it is passed to the caller, and caused strange
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behaviour.
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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---
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libc/inet/resolv.c | 4 +---
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1 files changed, 1 insertions(+), 3 deletions(-)
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diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
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index 056539f..9459199 100644
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--- a/libc/inet/resolv.c
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+++ b/libc/inet/resolv.c
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@@ -1517,10 +1517,8 @@ int attribute_hidden __dns_lookup(const char *name,
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memcpy(a, &ma, sizeof(ma));
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if (a->atype != T_SIG && (NULL == a->buf || (type != T_A && type != T_AAAA)))
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break;
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- if (a->atype != type) {
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- free(a->dotted);
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+ if (a->atype != type)
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continue;
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- }
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a->add_count = h.ancount - j - 1;
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if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen)
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break;
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--
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1.7.0
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