| 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-2021-47479: staging: rtl8712: fix use-after-free in rtl8712_dl_fw |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| staging: rtl8712: fix use-after-free in rtl8712_dl_fw |
| |
| Syzbot reported use-after-free in rtl8712_dl_fw(). The problem was in |
| race condition between r871xu_dev_remove() ->ndo_open() callback. |
| |
| It's easy to see from crash log, that driver accesses released firmware |
| in ->ndo_open() callback. It may happen, since driver was releasing |
| firmware _before_ unregistering netdev. Fix it by moving |
| unregister_netdev() before cleaning up resources. |
| |
| Call Trace: |
| ... |
| rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline] |
| rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170 |
| rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline] |
| rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394 |
| netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380 |
| __dev_open+0x2bc/0x4d0 net/core/dev.c:1484 |
| |
| Freed by task 1306: |
| ... |
| release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053 |
| r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599 |
| usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 |
| |
| The Linux kernel CVE team has assigned CVE-2021-47479 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.3 with commit 8c213fa59199f9673d66970d6940fa093186642f and fixed in 5.10.79 with commit c430094541a80575259a94ff879063ef01473506 |
| Issue introduced in 3.3 with commit 8c213fa59199f9673d66970d6940fa093186642f and fixed in 5.14.18 with commit befd23bd3b17f1a3f9c943a8580b47444c7c63ed |
| Issue introduced in 3.3 with commit 8c213fa59199f9673d66970d6940fa093186642f and fixed in 5.15.2 with commit a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4 |
| Issue introduced in 3.3 with commit 8c213fa59199f9673d66970d6940fa093186642f and fixed in 5.16 with commit c052cc1a069c3e575619cf64ec427eb41176ca70 |
| Issue introduced in 3.2.6 with commit bc5d453eab4506cb52397db8830d1070904265a4 |
| |
| 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-2021-47479 |
| 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/staging/rtl8712/usb_intf.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/c430094541a80575259a94ff879063ef01473506 |
| https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed |
| https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4 |
| https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70 |
