| 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-2020-36784: i2c: cadence: fix reference leak when pm_runtime_get_sync fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| i2c: cadence: fix reference leak when pm_runtime_get_sync fails |
| |
| The PM reference count is not expected to be incremented on |
| return in functions cdns_i2c_master_xfer and cdns_reg_slave. |
| |
| However, pm_runtime_get_sync will increment pm usage counter |
| 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-2020-36784 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.5 with commit 7fa32329ca03148fb2c07b4ef3247b8fc0488d6a and fixed in 5.10.37 with commit 30410519328c94367e561fd878e5f0d3a0303585 |
| Issue introduced in 4.5 with commit 7fa32329ca03148fb2c07b4ef3247b8fc0488d6a and fixed in 5.11.21 with commit d57ff04e0ed6f3be1682ae861ead33f879225e07 |
| Issue introduced in 4.5 with commit 7fa32329ca03148fb2c07b4ef3247b8fc0488d6a and fixed in 5.12.4 with commit a45fc41beed8e0fe31864619c34aa00797fb60c1 |
| Issue introduced in 4.5 with commit 7fa32329ca03148fb2c07b4ef3247b8fc0488d6a and fixed in 5.13 with commit 23ceb8462dc6f4b4decdb5536a7e5fc477cdf0b6 |
| |
| 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-2020-36784 |
| 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-cadence.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/30410519328c94367e561fd878e5f0d3a0303585 |
| https://git.kernel.org/stable/c/d57ff04e0ed6f3be1682ae861ead33f879225e07 |
| https://git.kernel.org/stable/c/a45fc41beed8e0fe31864619c34aa00797fb60c1 |
| https://git.kernel.org/stable/c/23ceb8462dc6f4b4decdb5536a7e5fc477cdf0b6 |
