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Date: Wed, 28 Feb 2024 09:14:22 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2020-36784: i2c: cadence: fix reference leak when pm_runtime_get_sync fails From: gregkh@...nel.org 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 7fa32329ca03 and fixed in 5.10.37 with commit 30410519328c Issue introduced in 4.5 with commit 7fa32329ca03 and fixed in 5.11.21 with commit d57ff04e0ed6 Issue introduced in 4.5 with commit 7fa32329ca03 and fixed in 5.12.4 with commit a45fc41beed8 Issue introduced in 4.5 with commit 7fa32329ca03 and fixed in 5.13 with commit 23ceb8462dc6 Please see https://www.kernel.org or 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
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