| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-42282: net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling |
| |
| Description |
| =========== |
| |
| 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]. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42282 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit b209bd6d0bffb8991aba568e2d9a892c86a1a43c and fixed in 6.10.3 with commit af6bd5c9901b13a26eaf4d57d97a813297791596 |
| Issue introduced in 6.10 with commit b209bd6d0bffb8991aba568e2d9a892c86a1a43c and fixed in 6.11 with commit 16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-42282 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/net/ethernet/mediatek/mtk_eth_soc.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/af6bd5c9901b13a26eaf4d57d97a813297791596 |
| https://git.kernel.org/stable/c/16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef |
