| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49826: ata: libata-transport: fix double ata_host_put() in ata_tport_add() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ata: libata-transport: fix double ata_host_put() in ata_tport_add() |
| |
| In the error path in ata_tport_add(), when calling put_device(), |
| ata_tport_release() is called, it will put the refcount of 'ap->host'. |
| |
| And then ata_host_put() is called again, the refcount is decreased |
| to 0, ata_host_release() is called, all ports are freed and set to |
| null. |
| |
| When unbinding the device after failure, ata_host_stop() is called |
| to release the resources, it leads a null-ptr-deref(), because all |
| the ports all freed and null. |
| |
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 |
| CPU: 7 PID: 18671 Comm: modprobe Kdump: loaded Tainted: G E 6.1.0-rc3+ #8 |
| pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| pc : ata_host_stop+0x3c/0x84 [libata] |
| lr : release_nodes+0x64/0xd0 |
| Call trace: |
| ata_host_stop+0x3c/0x84 [libata] |
| release_nodes+0x64/0xd0 |
| devres_release_all+0xbc/0x1b0 |
| device_unbind_cleanup+0x20/0x70 |
| really_probe+0x158/0x320 |
| __driver_probe_device+0x84/0x120 |
| driver_probe_device+0x44/0x120 |
| __driver_attach+0xb4/0x220 |
| bus_for_each_dev+0x78/0xdc |
| driver_attach+0x2c/0x40 |
| bus_add_driver+0x184/0x240 |
| driver_register+0x80/0x13c |
| __pci_register_driver+0x4c/0x60 |
| ahci_pci_driver_init+0x30/0x1000 [ahci] |
| |
| Fix this by removing redundant ata_host_put() in the error path. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49826 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 4.19.267 with commit 30e12e2be27ac6c4be2af4163c70db381364706f |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 5.4.225 with commit bec9ded5404cb14e5f5470103d0973a2ff83d6a5 |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 5.10.156 with commit ac471468f7c16cda2525909946ca13ddbcd14000 |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 5.15.80 with commit 377ff82c33c0cb74562a353361b64b33c09562cf |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 6.0.10 with commit 865a6da40ba092c18292ae5f6194756131293745 |
| Issue introduced in 4.17 with commit 2623c7a5f2799569d8bb05eb211da524a8144cb3 and fixed in 6.1 with commit 8c76310740807ade5ecdab5888f70ecb6d35732e |
| |
| 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-2022-49826 |
| 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/ata/libata-transport.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/30e12e2be27ac6c4be2af4163c70db381364706f |
| https://git.kernel.org/stable/c/bec9ded5404cb14e5f5470103d0973a2ff83d6a5 |
| https://git.kernel.org/stable/c/ac471468f7c16cda2525909946ca13ddbcd14000 |
| https://git.kernel.org/stable/c/377ff82c33c0cb74562a353361b64b33c09562cf |
| https://git.kernel.org/stable/c/865a6da40ba092c18292ae5f6194756131293745 |
| https://git.kernel.org/stable/c/8c76310740807ade5ecdab5888f70ecb6d35732e |
