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Message-ID: <2024022820-CVE-2020-36783-8372@gregkh> Date: Wed, 28 Feb 2024 09:14:21 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2020-36783: i2c: img-scb: 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: img-scb: fix reference leak when pm_runtime_get_sync fails The PM reference count is not expected to be incremented on return in functions img_i2c_xfer and img_i2c_init. 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-2020-36783 to this issue. Affected and fixed versions =========================== Issue introduced in 4.15 with commit 93222bd9b966 and fixed in 5.4.119 with commit 4734c4b1d957 Issue introduced in 4.15 with commit 93222bd9b966 and fixed in 5.10.37 with commit e80ae8bde412 Issue introduced in 4.15 with commit 93222bd9b966 and fixed in 5.11.21 with commit 96c4a03658d6 Issue introduced in 4.15 with commit 93222bd9b966 and fixed in 5.12.4 with commit 7ee35cde1e81 Issue introduced in 4.15 with commit 93222bd9b966 and fixed in 5.13 with commit 223125e37af8 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-2020-36783 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-img-scb.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/4734c4b1d9573c9d20bbc46cf37dde095ee011b8 https://git.kernel.org/stable/c/e80ae8bde41266d3b8bf012460b6593851766006 https://git.kernel.org/stable/c/96c4a03658d661666c360959aa80cdabfe2972ed https://git.kernel.org/stable/c/7ee35cde1e810ad6ca589980b9ec2b7b62946a5b https://git.kernel.org/stable/c/223125e37af8a641ea4a09747a6a52172fc4b903
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