| 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-2020-36779: i2c: stm32f7: fix reference leak when pm_runtime_get_sync fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| i2c: stm32f7: fix reference leak when pm_runtime_get_sync fails |
| |
| The PM reference count is not expected to be incremented on |
| return in these stm32f7_i2c_xx serious functions. |
| |
| However, pm_runtime_get_sync will increment the PM reference |
| count even failed. Forgetting to putting operation will result |
| in a reference leak here. |
| |
| Replace it with pm_runtime_resume_and_get to keep usage |
| counter balanced. |
| |
| The Linux kernel CVE team has assigned CVE-2020-36779 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit ea6dd25deeb5b797a145be7f860e3085e7d104c3 and fixed in 5.10.37 with commit c323b270a52a26aa8038a4d1fd9a850904a41166 |
| Issue introduced in 5.6 with commit ea6dd25deeb5b797a145be7f860e3085e7d104c3 and fixed in 5.11.21 with commit d791b90f5c5e5aa8ccf9e33386c16bd2b7e333a4 |
| Issue introduced in 5.6 with commit ea6dd25deeb5b797a145be7f860e3085e7d104c3 and fixed in 5.12.4 with commit c7ea772c9fcf711ed566814b92eecaffc0e2bfd0 |
| Issue introduced in 5.6 with commit ea6dd25deeb5b797a145be7f860e3085e7d104c3 and fixed in 5.13 with commit 2c662660ce2bd3b09dae21a9a9ac9395e1e6c00b |
| |
| 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-2020-36779 |
| 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/i2c/busses/i2c-stm32f7.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/c323b270a52a26aa8038a4d1fd9a850904a41166 |
| https://git.kernel.org/stable/c/d791b90f5c5e5aa8ccf9e33386c16bd2b7e333a4 |
| https://git.kernel.org/stable/c/c7ea772c9fcf711ed566814b92eecaffc0e2bfd0 |
| https://git.kernel.org/stable/c/2c662660ce2bd3b09dae21a9a9ac9395e1e6c00b |
