Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following:
if (newport > serial->num_ports) { dev_err(&port->dev, “%s - port change to invalid port: %i\n”, func, newport); break; }
The condition doesn’t account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of “port” in the following code is out-of-bounds and NULL:
serial_priv->current_port = newport; port = serial->port[serial_priv->current_port];
The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.
Details
- Affected product:
- AlmaLinux 9.2 ESU , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- linux-hwe @ 4.15.0 (+14 more)
In the Linux kernel, the following vulnerability has been resolved:
USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following:
if (newport > serial->num_ports) { dev_err(&port->dev, “%s - port change to invalid port: %i\n”, func, newport); break; }
The condition doesn’t account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of “port” in the following code is out-of-bounds and NULL:
serial_priv->current_port = newport; port = serial->port[serial_priv->current_port];
The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.