| 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-2021-47283: net:sfc: fix non-freed irq in legacy irq mode |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net:sfc: fix non-freed irq in legacy irq mode |
| |
| SFC driver can be configured via modparam to work using MSI-X, MSI or |
| legacy IRQ interrupts. In the last one, the interrupt was not properly |
| released on module remove. |
| |
| It was not freed because the flag irqs_hooked was not set during |
| initialization in the case of using legacy IRQ. |
| |
| Example of (trimmed) trace during module remove without this fix: |
| |
| remove_proc_entry: removing non-empty directory 'irq/125', leaking at least '0000:3b:00.1' |
| WARNING: CPU: 39 PID: 3658 at fs/proc/generic.c:715 remove_proc_entry+0x15c/0x170 |
| ...trimmed... |
| Call Trace: |
| unregister_irq_proc+0xe3/0x100 |
| free_desc+0x29/0x70 |
| irq_free_descs+0x47/0x70 |
| mp_unmap_irq+0x58/0x60 |
| acpi_unregister_gsi_ioapic+0x2a/0x40 |
| acpi_pci_irq_disable+0x78/0xb0 |
| pci_disable_device+0xd1/0x100 |
| efx_pci_remove+0xa1/0x1e0 [sfc] |
| pci_device_remove+0x38/0xa0 |
| __device_release_driver+0x177/0x230 |
| driver_detach+0xcb/0x110 |
| bus_remove_driver+0x58/0xd0 |
| pci_unregister_driver+0x2a/0xb0 |
| efx_exit_module+0x24/0xf40 [sfc] |
| __do_sys_delete_module.constprop.0+0x171/0x280 |
| ? exit_to_user_mode_prepare+0x83/0x1d0 |
| do_syscall_64+0x3d/0x80 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae |
| RIP: 0033:0x7f9f9385800b |
| ...trimmed... |
| |
| The Linux kernel CVE team has assigned CVE-2021-47283 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.44 with commit 8d717c9135a3340ae62d1699484850bfb4112b0c |
| Fixed in 5.12.11 with commit 81c4d1d83f88e15b26f4522a35cba6ffd8c5dfdd |
| Fixed in 5.13 with commit 8f03eeb6e0a0a0b8d617ee0a4bce729e47130036 |
| |
| 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-2021-47283 |
| 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/net/ethernet/sfc/nic.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/8d717c9135a3340ae62d1699484850bfb4112b0c |
| https://git.kernel.org/stable/c/81c4d1d83f88e15b26f4522a35cba6ffd8c5dfdd |
| https://git.kernel.org/stable/c/8f03eeb6e0a0a0b8d617ee0a4bce729e47130036 |
