linux-kernel - [PATCH 1/3] arch/powerpc/platforms: Eliminate use after free

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Message-ID: <Pine.LNX.4.64.1004021440020.17695@ask.diku.dk>
Date:	Fri, 2 Apr 2010 14:47:13 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/3] arch/powerpc/platforms: Eliminate use after free

From: Julia Lawall <julia@...u.dk>

dlpar_free_cc_nodes frees its argument, so dlpar_online_cpu should not be
called on the same value.  Skip over the call to dlpar_online_cpu by
jumping directly to out.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E,E2;
@@

dlpar_free_cc_nodes(E)
...
(
  E = E2
|
* E
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 arch/powerpc/platforms/pseries/dlpar.c         |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index e1682bc..1540a41 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -433,6 +433,7 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
 	if (rc) {
 		dlpar_release_drc(drc_index);
 		dlpar_free_cc_nodes(dn);
+		goto out;
 	}
 
 	rc = dlpar_online_cpu(dn);
--
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