| 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-2023-52473: thermal: core: Fix NULL pointer dereference in zone registration error path |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| thermal: core: Fix NULL pointer dereference in zone registration error path |
| |
| If device_register() in thermal_zone_device_register_with_trips() |
| returns an error, the tz variable is set to NULL and subsequently |
| dereferenced in kfree(tz->tzp). |
| |
| Commit adc8749b150c ("thermal/drivers/core: Use put_device() if |
| device_register() fails") added the tz = NULL assignment in question to |
| avoid a possible double-free after dropping the reference to the zone |
| device. However, after commit 4649620d9404 ("thermal: core: Make |
| thermal_zone_device_unregister() return after freeing the zone"), that |
| assignment has become redundant, because dropping the reference to the |
| zone device does not cause the zone object to be freed any more. |
| |
| Drop it to address the NULL pointer dereference. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52473 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.4 with commit 3d439b1a2ad36c8b4ea151c8de25309d60d17407 and fixed in 6.6.14 with commit 335176dd8ebaca6493807dceea33c478305667fa |
| Issue introduced in 6.4 with commit 3d439b1a2ad36c8b4ea151c8de25309d60d17407 and fixed in 6.7.2 with commit 02871710b93058eb1249d5847c0b2d1c2c3c98ae |
| Issue introduced in 6.4 with commit 3d439b1a2ad36c8b4ea151c8de25309d60d17407 and fixed in 6.8 with commit 04e6ccfc93c5a1aa1d75a537cf27e418895e20ea |
| |
| 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-2023-52473 |
| 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/thermal/thermal_core.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/335176dd8ebaca6493807dceea33c478305667fa |
| https://git.kernel.org/stable/c/02871710b93058eb1249d5847c0b2d1c2c3c98ae |
| https://git.kernel.org/stable/c/04e6ccfc93c5a1aa1d75a537cf27e418895e20ea |
