linux-kernel - [PATCH 3.16 127/131] irda: Only insert new objects into the global database via setsockopt

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Date:   Sat, 29 Sep 2018 22:43:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Tyler Hicks" <tyhicks@...onical.com>,
        "Seth Arnold" <seth.arnold@...onical.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Stefan Bader" <stefan.bader@...onical.com>
Subject: [PATCH 3.16 127/131] irda: Only insert new objects into the
 global database via setsockopt

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Tyler Hicks <tyhicks@...onical.com>

The irda_setsockopt() function conditionally allocates memory for a new
self->ias_object or, in some cases, reuses the existing
self->ias_object. Existing objects were incorrectly reinserted into the
LM_IAS database which corrupted the doubly linked list used for the
hashbin implementation of the LM_IAS database. When combined with a
memory leak in irda_bind(), this issue could be leveraged to create a
use-after-free vulnerability in the hashbin list. This patch fixes the
issue by only inserting newly allocated objects into the database.

CVE-2018-6555

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tyler Hicks <tyhicks@...onical.com>
Reviewed-by: Seth Arnold <seth.arnold@...onical.com>
Reviewed-by: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/irda/af_irda.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -2053,7 +2053,11 @@ static int irda_setsockopt(struct socket
 			err = -EINVAL;
 			goto out;
 		}
-		irias_insert_object(ias_obj);
+
+		/* Only insert newly allocated objects */
+		if (free_ias)
+			irias_insert_object(ias_obj);
+
 		kfree(ias_opt);
 		break;
 	case IRLMP_IAS_DEL: