| 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-2021-47523: IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr |
| |
| This buffer is currently allocated in hfi1_init(): |
| |
| if (reinit) |
| ret = init_after_reset(dd); |
| else |
| ret = loadtime_init(dd); |
| if (ret) |
| goto done; |
| |
| /* allocate dummy tail memory for all receive contexts */ |
| dd->rcvhdrtail_dummy_kvaddr = dma_alloc_coherent(&dd->pcidev->dev, |
| sizeof(u64), |
| &dd->rcvhdrtail_dummy_dma, |
| GFP_KERNEL); |
| |
| if (!dd->rcvhdrtail_dummy_kvaddr) { |
| dd_dev_err(dd, "cannot allocate dummy tail memory\n"); |
| ret = -ENOMEM; |
| goto done; |
| } |
| |
| The reinit triggered path will overwrite the old allocation and leak it. |
| |
| Fix by moving the allocation to hfi1_alloc_devdata() and the deallocation |
| to hfi1_free_devdata(). |
| |
| The Linux kernel CVE team has assigned CVE-2021-47523 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.5 with commit 46b010d3eeb8eb29c740c4ef09c666485f5c07e6 and fixed in 5.10.85 with commit 2c08271f4ed0e24633b3f81ceff61052b9d45efc |
| Issue introduced in 4.5 with commit 46b010d3eeb8eb29c740c4ef09c666485f5c07e6 and fixed in 5.15.8 with commit 834d0fb978643eaf09da425de197cc16a7c2761b |
| Issue introduced in 4.5 with commit 46b010d3eeb8eb29c740c4ef09c666485f5c07e6 and fixed in 5.16 with commit 60a8b5a1611b4a26de4839ab9c1fc2a9cf3e17c1 |
| |
| 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-2021-47523 |
| 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/infiniband/hw/hfi1/init.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/2c08271f4ed0e24633b3f81ceff61052b9d45efc |
| https://git.kernel.org/stable/c/834d0fb978643eaf09da425de197cc16a7c2761b |
| https://git.kernel.org/stable/c/60a8b5a1611b4a26de4839ab9c1fc2a9cf3e17c1 |
