| 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-2021-47386: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field |
| |
| If driver read val value sufficient for |
| (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) |
| from device then Null pointer dereference occurs. |
| (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) |
| Also lm75[] does not serve a purpose anymore after switching to |
| devm_i2c_new_dummy_device() in w83791d_detect_subclients(). |
| |
| The patch fixes possible NULL pointer dereference by removing lm75[]. |
| |
| Found by Linux Driver Verification project (linuxtesting.org). |
| |
| [groeck: Dropped unnecessary continuation lines, fixed multi-line alignment] |
| |
| The Linux kernel CVE team has assigned CVE-2021-47386 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.151 with commit 44d3c480e4e2a75bf6296a18b4356157991ccd80 |
| Fixed in 5.10.71 with commit 516d9055039017a20a698103be2b556b4c976bb8 |
| Fixed in 5.14.10 with commit 16887ae4e3defd2c4e7913b6c539f33eaf4eac5c |
| Fixed in 5.15 with commit 943c15ac1b84d378da26bba41c83c67e16499ac4 |
| |
| 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-2021-47386 |
| 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/hwmon/w83791d.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/44d3c480e4e2a75bf6296a18b4356157991ccd80 |
| https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 |
| https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c |
| https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 |
