Medium · published August 17, 2024
In the Linux kernel, the following vulnerability has been resolved:
net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling
Move the freeing of the dummy net_device from mtk_free_dev() to
mtk_remove().
Previously, if alloc_netdev_dummy() failed in mtk_probe(),
eth->dummy_dev would be NULL. The error path would then call
mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev
was allocated (but it was not), potentially causing a NULL pointer
dereference.
By moving free_netdev() to mtk_remove(), we ensure it's only called when
mtk_probe() has succeeded and dummy_dev is fully allocated. This
addresses a potential NULL pointer dereference detected by Smatch[1].
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 6.10, < 6.10.3 | 6.10.3 |