FAILED: patch "[PATCH] USB: serial: digi_acceleport: fix memory corruption with" failed to apply to 6.18-stable tree

FAILED: patch "[PATCH] USB: serial: digi_acceleport: fix memory corruption with" failed to apply to 6.18-stable tree

[gregkh]

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x cb3560e8eab1dfa1cac1ed52631adf8ec6ff2cd5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026060427-gossip-stony-dea7@gregkh' --subject-prefix 'PATCH 6.18.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From cb3560e8eab1dfa1cac1ed52631adf8ec6ff2cd5 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 20 May 2026 16:26:22 +0200
Subject: [PATCH] USB: serial: digi_acceleport: fix memory corruption with
 small endpoints

Add the missing bulk-out buffer size sanity checks to avoid
out-of-bounds memory accesses or slab corruption should a malicious
device report smaller buffers than expected.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index d515df045c4c..c481208255eb 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1229,15 +1229,34 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
 static int digi_startup(struct usb_serial *serial)
 {
 	struct digi_serial *serial_priv;
+	int oob_port_num;
 	int ret;
+	int i;
+
+	/*
+	 * The port bulk-out buffers must be large enough for header and
+	 * buffered data.
+	 */
+	for (i = 0; i < serial->type->num_ports; i++) {
+		if (serial->port[i]->bulk_out_size < DIGI_OUT_BUF_SIZE + 2)
+			return -EINVAL;
+	}
+
+	/*
+	 * The OOB port bulk-out buffer must be large enough for the two
+	 * commands in digi_set_modem_signals().
+	 */
+	oob_port_num = serial->type->num_ports;
+	if (serial->port[oob_port_num]->bulk_out_size < 8)
+		return -EINVAL;
 
 	serial_priv = kzalloc_obj(*serial_priv);
 	if (!serial_priv)
 		return -ENOMEM;
 
 	spin_lock_init(&serial_priv->ds_serial_lock);
-	serial_priv->ds_oob_port_num = serial->type->num_ports;
-	serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
+	serial_priv->ds_oob_port_num = oob_port_num;
+	serial_priv->ds_oob_port = serial->port[oob_port_num];
 
 	ret = digi_port_init(serial_priv->ds_oob_port,
 						serial_priv->ds_oob_port_num);

[PATCH 6.18.y] USB: serial: digi_acceleport: fix memory corruption with small endpoints

[Johan Hovold]

commit cb3560e8eab1dfa1cac1ed52631adf8ec6ff2cd5 upstream.

Add the missing bulk-out buffer size sanity checks to avoid
out-of-bounds memory accesses or slab corruption should a malicious
device report smaller buffers than expected.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
---

Should apply also to older trees without kzalloc_obj().

Johan


 drivers/usb/serial/digi_acceleport.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index a06485965412..a876d6629b65 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1229,15 +1229,34 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
 static int digi_startup(struct usb_serial *serial)
 {
 	struct digi_serial *serial_priv;
+	int oob_port_num;
 	int ret;
+	int i;
+
+	/*
+	 * The port bulk-out buffers must be large enough for header and
+	 * buffered data.
+	 */
+	for (i = 0; i < serial->type->num_ports; i++) {
+		if (serial->port[i]->bulk_out_size < DIGI_OUT_BUF_SIZE + 2)
+			return -EINVAL;
+	}
+
+	/*
+	 * The OOB port bulk-out buffer must be large enough for the two
+	 * commands in digi_set_modem_signals().
+	 */
+	oob_port_num = serial->type->num_ports;
+	if (serial->port[oob_port_num]->bulk_out_size < 8)
+		return -EINVAL;
 
 	serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 	if (!serial_priv)
 		return -ENOMEM;
 
 	spin_lock_init(&serial_priv->ds_serial_lock);
-	serial_priv->ds_oob_port_num = serial->type->num_ports;
-	serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
+	serial_priv->ds_oob_port_num = oob_port_num;
+	serial_priv->ds_oob_port = serial->port[oob_port_num];
 
 	ret = digi_port_init(serial_priv->ds_oob_port,
 						serial_priv->ds_oob_port_num);
-- 
2.53.0

Re: [PATCH 6.18.y] USB: serial: digi_acceleport: fix memory corruption with small endpoints

[Sasha Levin]

> [PATCH 6.18.y] USB: serial: digi_acceleport: fix memory corruption with small endpoints

Queued for 6.18.y, 6.12.y, 6.6.y, 6.1.y, 5.15.y and 5.10.y, thanks.

-- 
Thanks,
Sasha