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PJPROJECT 2.5.5 introduced a race condition with the -r5349 IPv6 DNS patch. The patch below fixes a write to freed memory under cartain DNS lookup conditions. 0006-r5477-svn-backport-Fix-DNS-write-on-freed-memory.patch ASTERISK-26516 Reported by: Richard Mudgett Change-Id: Ifdfae9ecf1e41b53080f33aab44ce1a220f349c5
34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From 732a997010d60fe93a7453e809672386749b0afc Mon Sep 17 00:00:00 2001
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From: Richard Mudgett <rmudgett@digium.com>
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Date: Tue, 1 Nov 2016 12:55:31 -0500
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Subject: [PATCH] r5477 svn backport Fix DNS write on freed memory.
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Re #1974: Fix DNS write on freed memory.
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Thanks to Richard Mudgett for the patch.
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---
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pjlib-util/src/pjlib-util/resolver.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/pjlib-util/src/pjlib-util/resolver.c b/pjlib-util/src/pjlib-util/resolver.c
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index 52b7655..365772e 100644
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--- a/pjlib-util/src/pjlib-util/resolver.c
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+++ b/pjlib-util/src/pjlib-util/resolver.c
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@@ -908,7 +908,13 @@ PJ_DEF(pj_status_t) pj_dns_resolver_start_query( pj_dns_resolver *resolver,
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/* Must return PJ_SUCCESS */
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status = PJ_SUCCESS;
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- goto on_return;
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+ /*
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+ * We cannot write to *p_query after calling cb because what
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+ * p_query points to may have been freed by cb.
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+ * Refer to ticket #1974.
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+ */
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+ pj_mutex_unlock(resolver->mutex);
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+ return status;
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}
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/* At this point, we have a cached entry, but this entry has expired.
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--
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1.7.9.5
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