linux-kernel - [patch] mempolicy: ERR_PTR dereference in mpol_shared_policy

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Message-ID: <20100525215401.GA2506@bicker>
Date:	Tue, 25 May 2010 23:54:01 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Lee Schermerhorn <lee.schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] mempolicy: ERR_PTR dereference in mpol_shared_policy_init()

The original code called mpol_put(new) while "new" was an ERR_PTR.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 7575101..5d6fb33 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2098,7 +2098,7 @@ void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol)
 		/* contextualize the tmpfs mount point mempolicy */
 		new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask);
 		if (IS_ERR(new))
-			goto put_free; /* no valid nodemask intersection */
+			goto free_scratch; /* no valid nodemask intersection */
 
 		task_lock(current);
 		ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch);
@@ -2114,6 +2114,7 @@ void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol)
 
 put_free:
 		mpol_put(new);			/* drop initial ref */
+free_scratch:
 		NODEMASK_SCRATCH_FREE(scratch);
 	}
 }
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