| 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-2021-47077: scsi: qedf: Add pointer checks in qedf_update_link_speed() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: qedf: Add pointer checks in qedf_update_link_speed() |
| |
| The following trace was observed: |
| |
| [ 14.042059] Call Trace: |
| [ 14.042061] <IRQ> |
| [ 14.042068] qedf_link_update+0x144/0x1f0 [qedf] |
| [ 14.042117] qed_link_update+0x5c/0x80 [qed] |
| [ 14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed] |
| [ 14.042155] ? qed_set_ptt+0x70/0x80 [qed] |
| [ 14.042170] ? qed_set_ptt+0x70/0x80 [qed] |
| [ 14.042186] ? qed_rd+0x13/0x40 [qed] |
| [ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed] |
| [ 14.042221] ? qed_set_ptt+0x70/0x80 [qed] |
| [ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed] |
| [ 14.042245] tasklet_action_common.isra.14+0x5a/0x100 |
| [ 14.042250] __do_softirq+0xe4/0x2f8 |
| [ 14.042253] irq_exit+0xf7/0x100 |
| [ 14.042255] do_IRQ+0x7f/0xd0 |
| [ 14.042257] common_interrupt+0xf/0xf |
| [ 14.042259] </IRQ> |
| |
| API qedf_link_update() is getting called from QED but by that time |
| shost_data is not initialised. This results in a NULL pointer dereference |
| when we try to dereference shost_data while updating supported_speeds. |
| |
| Add a NULL pointer check before dereferencing shost_data. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47077 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.11 with commit 61d8658b4a435eac729966cc94cdda077a8df5cd and fixed in 5.10.40 with commit a6362a737572f66051deb7637f3f77ddf7a4402f |
| Issue introduced in 4.11 with commit 61d8658b4a435eac729966cc94cdda077a8df5cd and fixed in 5.12.7 with commit 11014efcec378bb0050a6cf08eaf375e3693400a |
| Issue introduced in 4.11 with commit 61d8658b4a435eac729966cc94cdda077a8df5cd and fixed in 5.13 with commit 73578af92a0fae6609b955fcc9113e50e413c80f |
| |
| 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-2021-47077 |
| 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/scsi/qedf/qedf_main.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/a6362a737572f66051deb7637f3f77ddf7a4402f |
| https://git.kernel.org/stable/c/11014efcec378bb0050a6cf08eaf375e3693400a |
| https://git.kernel.org/stable/c/73578af92a0fae6609b955fcc9113e50e413c80f |
