CVE-2022-49210

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> MIPS: pgalloc: fix memory leak caused by pgd_free()<br /> <br /> pgd page is freed by generic implementation pgd_free() since commit<br /> f9cb654cb550 ("asm-generic: pgalloc: provide generic pgd_free()"),<br /> however, there are scenarios that the system uses more than one page as<br /> the pgd table, in such cases the generic implementation pgd_free() won&amp;#39;t<br /> be applicable anymore. For example, when PAGE_SIZE_4KB is enabled and<br /> MIPS_VA_BITS_48 is not enabled in a 64bit system, the macro "PGD_ORDER"<br /> will be set as "1", which will cause allocating two pages as the pgd<br /> table. Well, at the same time, the generic implementation pgd_free()<br /> just free one pgd page, which will result in the memory leak.<br /> <br /> The memory leak can be easily detected by executing shell command:<br /> "while true; do ls &gt; /dev/null; grep MemFree /proc/meminfo; done"