CVE-2021-47172 Information

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.

Reference

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