In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (coretemp) Fix core_data leak on CPUs without PTS<\/p>\n
pdata->core_data is allocated in init_temp_data() when the first core
\ntemp_data of a package is created, but it is only released from
\ndestroy_temp_data(), and only in the branch that handles the package
\ntemp_data.<\/p>\n
Package temp_data is created solely when the CPU supports
\nX86_FEATURE_PTS. On a CPU without it, coretemp_cpu_online() never calls
\ncoretemp_add_core() with pkg_flag set, so pdata->pkg_data stays NULL.
\ncoretemp_cpu_offline() then skips the removal of the package interface,
\ndestroy_temp_data() is never called for package data, and the array is
\nstill allocated when coretemp_device_remove() frees the platform data
\nthat pointed at it.<\/p>\n
Release the array in coretemp_device_remove(). destroy_temp_data() sets
\npdata->core_data to NULL when it frees it, so the added kfree() is a
\nno-op on CPUs that do have PTS.<\/p>\n
Tested on an Intel Core i5-1135G7. The driver was instrumented to log
\nevery allocation and release of pdata->core_data, and the PTS check in
\ncoretemp_cpu_online() was patched out to emulate a CPU without package
\nthermal support. Without this change the array was allocated and never
\nreleased, and coretemp_device_remove() still saw a non-NULL pointer.
\nWith it the array is released and the pointer accounting balances. On an
\nunmodified build the release still happens via the package temp_data and
\nthe added kfree() sees NULL, with no slab warnings over repeated module
\nload and unload cycles.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
hwmon: (coretemp) Fix core_data leak on CPUs without PTS<\/p>\n
pdata->core_data is allocated in init_temp_data() when the first core
\ntem<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25587","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}