linux-kernel - [PATCH] RDMA: fix use-after-free in rxe_queue

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: <20211121202239.3129-1-paskripkin@gmail.com>
Date:   Sun, 21 Nov 2021 23:22:39 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     zyjzyj2000@...il.com, dledford@...hat.com, jgg@...pe.ca,
        leon@...nel.org
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>,
        syzbot+aab53008a5adf26abe91@...kaller.appspotmail.com
Subject: [PATCH] RDMA: fix use-after-free in rxe_queue_cleanup

On error handling path in rxe_qp_from_init() qp->sq.queue is freed and
then rxe_create_qp() will drop last reference to this object. qp clean
up function will try to free this queue one time and it causes UAF bug.

Fix it by zeroing queue pointer after freeing queue in
rxe_qp_from_init().

Fixes: 514aee660df4 ("RDMA: Globally allocate and release QP memory")
Reported-by: syzbot+aab53008a5adf26abe91@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/infiniband/sw/rxe/rxe_qp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c
index 975321812c87..54b8711321c1 100644
--- a/drivers/infiniband/sw/rxe/rxe_qp.c
+++ b/drivers/infiniband/sw/rxe/rxe_qp.c
@@ -359,6 +359,7 @@ int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
 
 err2:
 	rxe_queue_cleanup(qp->sq.queue);
+	qp->sq.queue = NULL;
 err1:
 	qp->pd = NULL;
 	qp->rcq = NULL;
-- 
2.33.1