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Miller" , Nicolai Stange , Greg KH , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Chun-Yi Lee Subject: [PATCH v3] aoe: fix the potential use-after-free problem in more places Date: Wed, 2 Oct 2024 11:54:58 +0800 Message-Id: <20241002035458.24401-1-jlee@suse.com> X-Mailer: git-send-email 2.12.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs into use-after-free. Then Nicolai Stange found more places in aoe have potential use-after-free problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push packet to tx queue. So they should also use dev_hold() to increase the refcnt of skb->dev. On the other hand, moving dev_put() to tx() causes that the refcnt of skb->dev be reduced to a negative value, because corresponding dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(), probe(), and aoecmd_cfg_rsp(). This patch fixed this issue. Link: https://nvd.nist.gov/vuln/detail/CVE-2023-6270 Fixes: f98364e92662 ("aoe: fix the potential use-after-free problem in aoec= md_cfg_pkts") Reported-by: Nicolai Stange Signed-off-by: Chun-Yi Lee --- v3: Improve the patch description v2: - Improve the patch description - Improved wording - Add oneline summary of the commit f98364e92662 - Used curly brackets in the if-else blocks. drivers/block/aoe/aoecmd.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index cc9077b588d7..d1f4ddc57645 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -361,6 +361,7 @@ ata_rw_frameinit(struct frame *f) } =20 ah->cmdstat =3D ATA_CMD_PIO_READ | writebit | extbit; + dev_hold(t->ifp->nd); skb->dev =3D t->ifp->nd; } =20 @@ -401,6 +402,8 @@ aoecmd_ata_rw(struct aoedev *d) __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); + } else { + dev_put(f->t->ifp->nd); } return 1; } @@ -483,10 +486,13 @@ resend(struct aoedev *d, struct frame *f) memcpy(h->dst, t->addr, sizeof h->dst); memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); =20 + dev_hold(t->ifp->nd); skb->dev =3D t->ifp->nd; skb =3D skb_clone(skb, GFP_ATOMIC); - if (skb =3D=3D NULL) + if (skb =3D=3D NULL) { + dev_put(t->ifp->nd); return; + } f->sent =3D ktime_get(); __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); @@ -617,6 +623,8 @@ probe(struct aoetgt *t) __skb_queue_head_init(&queue); __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); + } else { + dev_put(f->t->ifp->nd); } } =20 @@ -1395,6 +1403,7 @@ aoecmd_ata_id(struct aoedev *d) ah->cmdstat =3D ATA_CMD_ID_ATA; ah->lba3 =3D 0xa0; =20 + dev_hold(t->ifp->nd); skb->dev =3D t->ifp->nd; =20 d->rttavg =3D RTTAVG_INIT; @@ -1404,6 +1413,8 @@ aoecmd_ata_id(struct aoedev *d) skb =3D skb_clone(skb, GFP_ATOMIC); if (skb) f->sent =3D ktime_get(); + else + dev_put(t->ifp->nd); =20 return skb; } --=20 2.35.3