| 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-2021-47063: drm: bridge/panel: Cleanup connector on bridge detach |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm: bridge/panel: Cleanup connector on bridge detach |
| |
| If we don't call drm_connector_cleanup() manually in |
| panel_bridge_detach(), the connector will be cleaned up with the other |
| DRM objects in the call to drm_mode_config_cleanup(). However, since our |
| drm_connector is devm-allocated, by the time drm_mode_config_cleanup() |
| will be called, our connector will be long gone. Therefore, the |
| connector must be cleaned up when the bridge is detached to avoid |
| use-after-free conditions. |
| |
| v2: Cleanup connector only if it was created |
| |
| v3: Add FIXME |
| |
| v4: (Use connector->dev) directly in if() block |
| |
| The Linux kernel CVE team has assigned CVE-2021-47063 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.13 with commit 13dfc0540a575b47b2d640b093ac16e9e09474f6 and fixed in 5.10.37 with commit ce450934a00cf896e648fde08d0bd1426653d7a2 |
| Issue introduced in 4.13 with commit 13dfc0540a575b47b2d640b093ac16e9e09474f6 and fixed in 5.11.21 with commit 18149b420c9bd93c443e8d1f48a063d71d9f6aa1 |
| Issue introduced in 4.13 with commit 13dfc0540a575b47b2d640b093ac16e9e09474f6 and fixed in 5.12.4 with commit 98d7d76a74e48ec3ddf2e23950adff7edcab9327 |
| Issue introduced in 4.13 with commit 13dfc0540a575b47b2d640b093ac16e9e09474f6 and fixed in 5.13 with commit 4d906839d321c2efbf3fed4bc31ffd9ff55b75c0 |
| |
| 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-2021-47063 |
| 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/gpu/drm/bridge/panel.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/ce450934a00cf896e648fde08d0bd1426653d7a2 |
| https://git.kernel.org/stable/c/18149b420c9bd93c443e8d1f48a063d71d9f6aa1 |
| https://git.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327 |
| https://git.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0 |
