| 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-2021-47503: scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc() |
| |
| Calling scsi_remove_host() before scsi_add_host() results in a crash: |
| |
| BUG: kernel NULL pointer dereference, address: 0000000000000108 |
| RIP: 0010:device_del+0x63/0x440 |
| Call Trace: |
| device_unregister+0x17/0x60 |
| scsi_remove_host+0xee/0x2a0 |
| pm8001_pci_probe+0x6ef/0x1b90 [pm80xx] |
| local_pci_probe+0x3f/0x90 |
| |
| We cannot call scsi_remove_host() in pm8001_alloc() because scsi_add_host() |
| has not been called yet at that point in time. |
| |
| Function call tree: |
| |
| pm8001_pci_probe() |
| | |
| `- pm8001_pci_alloc() |
| | | |
| | `- pm8001_alloc() |
| | | |
| | `- scsi_remove_host() |
| | |
| `- scsi_add_host() |
| |
| The Linux kernel CVE team has assigned CVE-2021-47503 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10 with commit 05c6c029a44d9f43715577e33e95eba87f44d285 and fixed in 5.10.85 with commit 1e434d2687e8bc0b3cdc9dd093c0e9047c0b4add |
| Issue introduced in 5.10 with commit 05c6c029a44d9f43715577e33e95eba87f44d285 and fixed in 5.15.8 with commit f8dccc1bdea7e21b5ec06c957aef8831c772661c |
| Issue introduced in 5.10 with commit 05c6c029a44d9f43715577e33e95eba87f44d285 and fixed in 5.16 with commit 653926205741add87a6cf452e21950eebc6ac10b |
| |
| 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-2021-47503 |
| 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/pm8001/pm8001_init.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/1e434d2687e8bc0b3cdc9dd093c0e9047c0b4add |
| https://git.kernel.org/stable/c/f8dccc1bdea7e21b5ec06c957aef8831c772661c |
| https://git.kernel.org/stable/c/653926205741add87a6cf452e21950eebc6ac10b |
