accel/rocket: clear rdev on device init failure

Overview

In the Linux kernel, the following vulnerability has been resolved:

accel/rocket: clear rdev on device init failure

rocket_probe() stores the return value from rocket_device_init() in the file-scoped rdev pointer before checking whether it is an error pointer. If rocket_device_init() fails, rdev is left as an ERR_PTR.

The rdev pointer is also used as the marker for whether the shared rocket device has already been initialized. A later core probe can therefore see a non-NULL rdev, skip rocket_device_init(), and dereference the error pointer when reading rdev->num_cores.

Save the error code and clear rdev before returning from the rocket_device_init() failure path.

Affected

• Linux >= ed98261b41687323ffa02ca20fef1e60b38fd1aa < 79071b67182e1b352d51a3917729b8d424710b49
• Linux >= ed98261b41687323ffa02ca20fef1e60b38fd1aa < dd47a6c920083b069f00f0920e4566915a6aec46
• Linux >= ed98261b41687323ffa02ca20fef1e60b38fd1aa < 4ac852419f0d317c7bd8db5b8acb3cc78be7fe33
• Linux 6.18

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.