CVE-2022-50417

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/panfrost: Fix GEM handle creation ref-counting<br /> <br /> panfrost_gem_create_with_handle() previously returned a BO but with the<br /> only reference being from the handle, which user space could in theory<br /> guess and release, causing a use-after-free. Additionally if the call to<br /> panfrost_gem_mapping_get() in panfrost_ioctl_create_bo() failed then<br /> a(nother) reference on the BO was dropped.<br /> <br /> The _create_with_handle() is a problematic pattern, so ditch it and<br /> instead create the handle in panfrost_ioctl_create_bo(). If the call to<br /> panfrost_gem_mapping_get() fails then this means that user space has<br /> indeed gone behind our back and freed the handle. In which case just<br /> return an error code.