概要

In the Linux kernel, the following vulnerability has been resolved:mtd: Fix gluebi NULL pointer dereference caused by ftl notifierIf both ftl.ko and gluebi.ko are loaded, the notifier of ftltriggers NULL pointer dereference when trying to access‘gluebi->desc’ in gluebi_read().ubi_gluebi_init ubi_register_volume_notifier ubi_enumerate_volumes ubi_notify_all gluebi_notify nb->notifier_call() gluebi_create mtd_device_register mtd_device_parse_register add_mtd_device blktrans_notify_add not->add() ftl_add_mtd tr->add_mtd() scan_header mtd_read mtd_read_oob mtd_read_oob_std gluebi_read mtd->read() gluebi->desc - NULLDetailed reproduction information available at the Link [1],In the normal case, obtain gluebi->desc in the gluebi_get_device(),and access gluebi->desc in the gluebi_read(). However,gluebi_get_device() is not executed in advance in theftl_add_mtd() process, which leads to NULL pointer dereference.The solution for the gluebi module is to run jffs2 on the UBIvolume without considering working with ftl or mtdblock [2].Therefore, this problem can be avoided by preventing gluebi fromcreating the mtdblock device after creating mtd partition of thetype MTD_UBIVOLUME.

CVSS v3 指标

安全公告

影响产品