| 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-2024-44992: smb/client: avoid possible NULL dereference in cifs_free_subrequest() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| smb/client: avoid possible NULL dereference in cifs_free_subrequest() |
| |
| Clang static checker (scan-build) warning: |
| cifsglob.h:line 890, column 3 |
| Access to field 'ops' results in a dereference of a null pointer. |
| |
| Commit 519be989717c ("cifs: Add a tracepoint to track credits involved in |
| R/W requests") adds a check for 'rdata->server', and let clang throw this |
| warning about NULL dereference. |
| |
| When 'rdata->credits.value != 0 && rdata->server == NULL' happens, |
| add_credits_and_wake_if() will call rdata->server->ops->add_credits(). |
| This will cause NULL dereference problem. Add a check for 'rdata->server' |
| to avoid NULL dereference. |
| |
| The Linux kernel CVE team has assigned CVE-2024-44992 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit 69c3c023af25edb5433a2db824d3e7cc328f0183 and fixed in 6.10.7 with commit fead60a6d5f84b472b928502a42c419253afe6c1 |
| Issue introduced in 6.10 with commit 69c3c023af25edb5433a2db824d3e7cc328f0183 and fixed in 6.11 with commit 74c2ab6d653b4c2354df65a7f7f2df1925a40a51 |
| |
| 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-2024-44992 |
| 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: |
| fs/smb/client/file.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/fead60a6d5f84b472b928502a42c419253afe6c1 |
| https://git.kernel.org/stable/c/74c2ab6d653b4c2354df65a7f7f2df1925a40a51 |
