| 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-2021-47095: ipmi: ssif: initialize ssif_info->client early |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipmi: ssif: initialize ssif_info->client early |
| |
| During probe ssif_info->client is dereferenced in error path. However, |
| it is set when some of the error checking has already been done. This |
| causes following kernel crash if an error path is taken: |
| |
| [ 30.645593][ T674] ipmi_ssif 0-000e: ipmi_ssif: Not probing, Interface already present |
| [ 30.657616][ T674] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000088 |
| ... |
| [ 30.657723][ T674] pc : __dev_printk+0x28/0xa0 |
| [ 30.657732][ T674] lr : _dev_err+0x7c/0xa0 |
| ... |
| [ 30.657772][ T674] Call trace: |
| [ 30.657775][ T674] __dev_printk+0x28/0xa0 |
| [ 30.657778][ T674] _dev_err+0x7c/0xa0 |
| [ 30.657781][ T674] ssif_probe+0x548/0x900 [ipmi_ssif 62ce4b08badc1458fd896206d9ef69a3c31f3d3e] |
| [ 30.657791][ T674] i2c_device_probe+0x37c/0x3c0 |
| ... |
| |
| Initialize ssif_info->client before any error path can be taken. Clear |
| i2c_client data in the error path to prevent the dangling pointer from |
| leaking. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47095 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4 with commit c4436c9149c5d2bc0c49ab57ec85c75ea1c4d61c and fixed in 5.4.169 with commit 8efd6a3391f7b0b19fb0c38e50add06ca30c94af |
| Issue introduced in 5.4 with commit c4436c9149c5d2bc0c49ab57ec85c75ea1c4d61c and fixed in 5.10.89 with commit 1f6ab847461ce7dd89ae9db2dd4658c993355d7c |
| Issue introduced in 5.4 with commit c4436c9149c5d2bc0c49ab57ec85c75ea1c4d61c and fixed in 5.15.12 with commit 77a7311ca167aa5b7055c549a940a56e73ee5f29 |
| Issue introduced in 5.4 with commit c4436c9149c5d2bc0c49ab57ec85c75ea1c4d61c and fixed in 5.16 with commit 34f35f8f14bc406efc06ee4ff73202c6fd245d15 |
| |
| 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-2021-47095 |
| 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/char/ipmi/ipmi_ssif.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/8efd6a3391f7b0b19fb0c38e50add06ca30c94af |
| https://git.kernel.org/stable/c/1f6ab847461ce7dd89ae9db2dd4658c993355d7c |
| https://git.kernel.org/stable/c/77a7311ca167aa5b7055c549a940a56e73ee5f29 |
| https://git.kernel.org/stable/c/34f35f8f14bc406efc06ee4ff73202c6fd245d15 |
