| 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-2022-49749: i2c: designware: use casting of u64 in clock multiplication to avoid overflow |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| i2c: designware: use casting of u64 in clock multiplication to avoid overflow |
| |
| In functions i2c_dw_scl_lcnt() and i2c_dw_scl_hcnt() may have overflow |
| by depending on the values of the given parameters including the ic_clk. |
| For example in our use case where ic_clk is larger than one million, |
| multiplication of ic_clk * 4700 will result in 32 bit overflow. |
| |
| Add cast of u64 to the calculation to avoid multiplication overflow, and |
| use the corresponding define for divide. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49749 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 5.10.166 with commit ed173f77fd28a3e4fffc13b3f28687b9eba61157 |
| Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 5.15.91 with commit 2f29d780bd691d20e89e5b35d5e6568607115e94 |
| Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 6.1.9 with commit 9f36aae9e80e79b7a6d62227eaa96935166be9fe |
| Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 6.2 with commit c8c37bc514514999e62a17e95160ed9ebf75ca8d |
| |
| 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-2022-49749 |
| 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-designware-common.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/ed173f77fd28a3e4fffc13b3f28687b9eba61157 |
| https://git.kernel.org/stable/c/2f29d780bd691d20e89e5b35d5e6568607115e94 |
| https://git.kernel.org/stable/c/9f36aae9e80e79b7a6d62227eaa96935166be9fe |
| https://git.kernel.org/stable/c/c8c37bc514514999e62a17e95160ed9ebf75ca8d |
