| 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-2021-47172: iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers |
| |
| Channel numbering must start at 0 and then not have any holes, or |
| it is possible to overflow the available storage. Note this bug was |
| introduced as part of a fix to ensure we didn't rely on the ordering |
| of child nodes. So we need to support arbitrary ordering but they all |
| need to be there somewhere. |
| |
| Note I hit this when using qemu to test the rest of this series. |
| Arguably this isn't the best fix, but it is probably the most minimal |
| option for backporting etc. |
| |
| Alexandru's sign-off is here because he carried this patch in a larger |
| set that Jonathan then applied. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47172 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4.14 with commit 5408cbc6337300d6f1a87c797273c535ed96305a and fixed in 5.4.124 with commit f49149964d2423fb618fb6b755bb1eaa431cca2c |
| Issue introduced in 5.5 with commit d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and fixed in 5.10.42 with commit f70122825076117787b91e7f219e21c09f11a5b9 |
| Issue introduced in 5.5 with commit d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and fixed in 5.12.9 with commit 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc |
| Issue introduced in 5.5 with commit d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 and fixed in 5.13 with commit f2a772c51206b0c3f262e4f6a3812c89a650191b |
| |
| 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-2021-47172 |
| 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/iio/adc/ad7124.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/f49149964d2423fb618fb6b755bb1eaa431cca2c |
| https://git.kernel.org/stable/c/f70122825076117787b91e7f219e21c09f11a5b9 |
| https://git.kernel.org/stable/c/26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc |
| https://git.kernel.org/stable/c/f2a772c51206b0c3f262e4f6a3812c89a650191b |
