CVE-2021-47060

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: Stop looking for coalesced MMIO zones if the bus is destroyed<br /> <br /> Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev()<br /> fails to allocate memory for the new instance of the bus. If it can&amp;#39;t<br /> instantiate a new bus, unregister_dev() destroys all devices _except_ the<br /> target device. But, it doesn&amp;#39;t tell the caller that it obliterated the<br /> bus and invoked the destructor for all devices that were on the bus. In<br /> the coalesced MMIO case, this can result in a deleted list entry<br /> dereference due to attempting to continue iterating on coalesced_zones<br /> after future entries (in the walk) have been deleted.<br /> <br /> Opportunistically add curly braces to the for-loop, which encompasses<br /> many lines but sneaks by without braces due to the guts being a single<br /> if statement.