CVE-2021-47289 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ACPI: fix NULL pointer dereference

Commit 71f642833284 (\ACPI: utils: Fix reference counting in for_each_acpi_dev_match()) started doing cpi_dev_put()\ on a pointer that was possibly NULL. That fails miserably because that helper inline function is not set up to handle that case.

Just make acpi_dev_put() silently accept a NULL pointer rather than calling down to put_device() with an invalid offset off that NULL pointer.

Reference

https://git.kernel.org/stable/c/38f54217b423c0101d03a00feec6fb8ec608b12e https://git.kernel.org/stable/c/cae3fa3d8165761f3000f523b11cfa1cd35206bc https://git.kernel.org/stable/c/ccf23a0888077a25a0793a746c3941db2a7562e4 https://git.kernel.org/stable/c/fc68f42aa737dc15e7665a4101d4168aadb8e4c4