In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tty: serial: 8250: protect against NULL uart->port.dev in register<\/p>\n
serial8250_register_8250_port() conditionally copies uart->port.dev
\nfrom up->port.dev only when up->port.dev is non-NULL:<\/p>\n
\tif (up->port.dev) {
\n\t\tuart->port.dev = up->port.dev;
\n\t\t…
\n\t}<\/p>\n
So if both the existing uart slot and up have a NULL ->dev,
\nuart->port.dev remains NULL. The very next ACPI companion check
\nthen dereferences it unconditionally:<\/p>\n
\tif (!has_acpi_companion(uart->port.dev)) {<\/p>\n
has_acpi_companion() reads dev->fwnode without a NULL guard
\n(include\/linux\/acpi.h), so this NULL-derefs the kernel for the
\nremaining no-dev case rather than just skipping the
\nmctrl_gpio_init() initialisation as intended.<\/p>\n
smatch flags the inconsistency:<\/p>\n
drivers\/tty\/serial\/8250\/8250_core.c:767
\n serial8250_register_8250_port() error: ‘uart->port.dev’ could be
\n null (see line 719)<\/p>\n
Guard the call with a NULL check so register continues to work
\nfor callers that legitimately have no parent device (legacy
\nnon-OF\/non-ACPI registrations).<\/p>\n
No functional change for callers that pass a non-NULL ->dev.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tty: serial: 8250: protect against NULL uart->port.dev in register<\/p>\n
serial8250_register_8250_port() conditionally copies uart->port<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28712","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28712","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=28712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}