| 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-2022-49307: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| tty: synclink_gt: Fix null-pointer-dereference in slgt_clean() |
| |
| When the driver fails at alloc_hdlcdev(), and then we remove the driver |
| module, we will get the following splat: |
| |
| [ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI |
| [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] |
| [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 |
| [ 25.077709] Call Trace: |
| [ 25.077924] <TASK> |
| [ 25.078108] unregister_hdlc_device+0x16/0x30 |
| [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt] |
| |
| Fix this by checking whether the 'info->netdev' is a null pointer first. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49307 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d |
| Fixed in 4.14.283 with commit 078212ad15dbd88840c82c97f12c93d83703c8fd |
| Fixed in 4.19.247 with commit ba08cbc5b53e151d0acf1930fb526fc65b7f3e65 |
| Fixed in 5.4.198 with commit f6e07eb7ebec53ffe81fc2489589320fbe4a6b75 |
| Fixed in 5.10.122 with commit d68d5e68b7f64de7170f8e04dd9b995c36b2c71c |
| Fixed in 5.15.47 with commit 8a95696bdc0e13f8980f05b54a3b9081963d1256 |
| Fixed in 5.17.15 with commit ddd67751ab86c6a65f95c35293c42f85a42ac05d |
| Fixed in 5.18.4 with commit 1ceb4ca9543a8a788febf6bc8dad2e605e172d5e |
| Fixed in 5.19 with commit 689ca31c542687709ba21ec2195c1fbce34fd029 |
| |
| 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-2022-49307 |
| 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/tty/synclink_gt.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/50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d |
| https://git.kernel.org/stable/c/078212ad15dbd88840c82c97f12c93d83703c8fd |
| https://git.kernel.org/stable/c/ba08cbc5b53e151d0acf1930fb526fc65b7f3e65 |
| https://git.kernel.org/stable/c/f6e07eb7ebec53ffe81fc2489589320fbe4a6b75 |
| https://git.kernel.org/stable/c/d68d5e68b7f64de7170f8e04dd9b995c36b2c71c |
| https://git.kernel.org/stable/c/8a95696bdc0e13f8980f05b54a3b9081963d1256 |
| https://git.kernel.org/stable/c/ddd67751ab86c6a65f95c35293c42f85a42ac05d |
| https://git.kernel.org/stable/c/1ceb4ca9543a8a788febf6bc8dad2e605e172d5e |
| https://git.kernel.org/stable/c/689ca31c542687709ba21ec2195c1fbce34fd029 |
