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[libmicrohttpd] the case of a memory leak

From: Piotr Grzybowski
Subject: [libmicrohttpd] the case of a memory leak
Date: Wed, 10 Aug 2011 09:30:43 +0200

hello all.

 recently i have talked with Christian about a memory leak, which i saw
in my application which uses libmicrohttpd. it seemed that it is
libmicrohttpd that leaks, but it turns out that, after further
it is gnutls that has a leak. it was triggered by a tool that sends more
or less exotic data during tls handshake.
 once i have introduced the following patch to gnutls the leak disappeared.
please keep in mind that this patch can introduce segfaults, because i have
no idea whether dataptr is used elsewhere. what i am sure of is that it is not
freed by gnutls in every possible case.

diff -Naur gnutls26-2.4.2/lib/gnutls_handshake.c
--- gnutls26-2.4.2/lib/gnutls_handshake.c       2008-09-15
22:04:19.000000000 +0200
+++ gnutls26-2.4.2-modified/lib/gnutls_handshake.c      2011-08-10
09:07:14.000000000 +0200
@@ -1245,6 +1245,7 @@
   if (ret < 0)
       gnutls_assert ();
+      gnutls_free (dataptr); //is dataptr used elsewhere?
       _gnutls_handshake_header_buffer_clear (session);
       return ret;

also i am sure that it was gnutls-2.4.2 that has the bug, since after
upgrading to gnutls-3.0 and
recompiling libmicrohttpd and my code the leak was not present.

hope this helps someone since it is off topic on that list:)


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