| 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-2021-47002: SUNRPC: Fix null pointer dereference in svc_rqst_free() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| SUNRPC: Fix null pointer dereference in svc_rqst_free() |
| |
| When alloc_pages_node() returns null in svc_rqst_alloc(), the |
| null rq_scratch_page pointer will be dereferenced when calling |
| put_page() in svc_rqst_free(). Fix it by adding a null check. |
| |
| Addresses-Coverity: ("Dereference after null check") |
| |
| The Linux kernel CVE team has assigned CVE-2021-47002 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.220 with commit 79e4e0d489c8e72b9efa388e504a036eec1550c6 and fixed in 5.10.221 with commit 3de81c1e84bf84803308da3272a829a7655c5336 |
| Issue introduced in 5.11 with commit 5191955d6fc65e6d4efe8f4f10a6028298f57281 and fixed in 5.11.22 with commit 1e10f58f1c9a6b667b045513c7a4e6111c24fe7c |
| Issue introduced in 5.11 with commit 5191955d6fc65e6d4efe8f4f10a6028298f57281 and fixed in 5.12.5 with commit c664aaec9aee544538a78ba4893a44bc73a6d742 |
| Issue introduced in 5.11 with commit 5191955d6fc65e6d4efe8f4f10a6028298f57281 and fixed in 5.13 with commit b9f83ffaa0c096b4c832a43964fe6bff3acffe10 |
| |
| 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-2021-47002 |
| 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: |
| net/sunrpc/svc.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/3de81c1e84bf84803308da3272a829a7655c5336 |
| https://git.kernel.org/stable/c/1e10f58f1c9a6b667b045513c7a4e6111c24fe7c |
| https://git.kernel.org/stable/c/c664aaec9aee544538a78ba4893a44bc73a6d742 |
| https://git.kernel.org/stable/c/b9f83ffaa0c096b4c832a43964fe6bff3acffe10 |
