| 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-2022-49285: iio: accel: mma8452: use the correct logic to get mma8452_data |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iio: accel: mma8452: use the correct logic to get mma8452_data |
| |
| The original logic to get mma8452_data is wrong, the *dev point to |
| the device belong to iio_dev. we can't use this dev to find the |
| correct i2c_client. The original logic happen to work because it |
| finally use dev->driver_data to get iio_dev. Here use the API |
| to_i2c_client() is wrong and make reader confuse. To correct the |
| logic, it should be like this |
| |
| struct mma8452_data *data = iio_priv(dev_get_drvdata(dev)); |
| |
| But after commit 8b7651f25962 ("iio: iio_device_alloc(): Remove |
| unnecessary self drvdata"), the upper logic also can't work. |
| When try to show the avialable scale in userspace, will meet kernel |
| dump, kernel handle NULL pointer dereference. |
| |
| So use dev_to_iio_dev() to correct the logic. |
| |
| Dual fixes tags as the second reflects when the bug was exposed, whilst |
| the first reflects when the original bug was introduced. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49285 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.4 with commit c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527 and fixed in 5.15.54 with commit 4c0bb583a4444cce224e8661090cbffc98e2fe07 |
| Issue introduced in 4.4 with commit c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527 and fixed in 5.17.2 with commit d2d9ebdbff79d87d27652578e6d1638ad3b5f3bf |
| Issue introduced in 4.4 with commit c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527 and fixed in 5.18 with commit c87b7b12f48db86ac9909894f4dc0107d7df6375 |
| |
| 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-2022-49285 |
| 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/iio/accel/mma8452.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/4c0bb583a4444cce224e8661090cbffc98e2fe07 |
| https://git.kernel.org/stable/c/d2d9ebdbff79d87d27652578e6d1638ad3b5f3bf |
| https://git.kernel.org/stable/c/c87b7b12f48db86ac9909894f4dc0107d7df6375 |
