linux-kernel - [PATCH 3.12 033/144] aio: fix kioctx leak introduced by "aio: Fix a trinity splat"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20140106223746.274506932@linuxfoundation.org>
Date:	Mon,  6 Jan 2014 14:36:34 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Benjamin LaHaise <bcrl@...ck.org>
Subject: [PATCH 3.12 033/144] aio: fix kioctx leak introduced by "aio: Fix a trinity splat"

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin LaHaise <bcrl@...ck.org>

commit 1881686f842065d2f92ec9c6424830ffc17d23b0 upstream.

e34ecee2ae791df674dfb466ce40692ca6218e43 reworked the percpu reference
counting to correct a bug trinity found.  Unfortunately, the change lead
to kioctxes being leaked because there was no final reference count to
put.  Add that reference count back in to fix things.

Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/aio.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/aio.c
+++ b/fs/aio.c
@@ -652,7 +652,8 @@ static struct kioctx *ioctx_alloc(unsign
 	aio_nr += ctx->max_reqs;
 	spin_unlock(&aio_nr_lock);
 
-	percpu_ref_get(&ctx->users); /* io_setup() will drop this ref */
+	percpu_ref_get(&ctx->users);	/* io_setup() will drop this ref */
+	percpu_ref_get(&ctx->reqs);	/* free_ioctx_users() will drop this */
 
 	err = ioctx_add_table(ctx, mm);
 	if (err)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/