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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubi: Fix race condition between ctrl_cdev_ioctl and ubi_cdev_ioctl\n\nHulk Robot reported a KASAN report about use-after-free:\n ==================================================================\n BUG: KASAN: use-after-free in __list_del_entry_valid+0x13d/0x160\n Read of size 8 at addr ffff888035e37d98 by task ubiattach/1385\n [...]\n Call Trace:\n  klist_dec_and_del+0xa7/0x4a0\n  klist_put+0xc7/0x1a0\n  device_del+0x4d4/0xed0\n  cdev_device_del+0x1a/0x80\n  ubi_attach_mtd_dev+0x2951/0x34b0 [ubi]\n  ctrl_cdev_ioctl+0x286/0x2f0 [ubi]\n\n Allocated by task 1414:\n  device_add+0x60a/0x18b0\n  cdev_device_add+0x103/0x170\n  ubi_create_volume+0x1118/0x1a10 [ubi]\n  ubi_cdev_ioctl+0xb7f/0x1ba0 [ubi]\n\n Freed by task 1385:\n  cdev_device_del+0x1a/0x80\n  ubi_remove_volume+0x438/0x6c0 [ubi]\n  ubi_cdev_ioctl+0xbf4/0x1ba0 [ubi]\n [...]\n ==================================================================\n\nThe lock held by ctrl_cdev_ioctl is ubi_devices_mutex, but the lock held\nby ubi_cdev_ioctl is ubi-\u003edevice_mutex. Therefore, the two locks can be\nconcurrent.\n\nctrl_cdev_ioctl contains two operations: ubi_attach and ubi_detach.\nubi_detach is bug-free because it uses reference counting to prevent\nconcurrency. However, uif_init and uif_close in ubi_attach may race with\nubi_cdev_ioctl.\n\nuif_init will race with ubi_cdev_ioctl as in the following stack.\n           cpu1                   cpu2                  cpu3\n_______________________|________________________|______________________\nctrl_cdev_ioctl\n ubi_attach_mtd_dev\n  uif_init\n                           ubi_cdev_ioctl\n                            ubi_create_volume\n                             cdev_device_add\n   ubi_add_volume\n   // sysfs exist\n   kill_volumes\n                                                    ubi_cdev_ioctl\n                                                     ubi_remove_volume\n                                                      cdev_device_del\n                                                       // first free\n    ubi_free_volume\n     cdev_del\n     // double free\n   cdev_device_del\n\nAnd uif_close will race with ubi_cdev_ioctl as in the following stack.\n           cpu1                   cpu2                  cpu3\n_______________________|________________________|______________________\nctrl_cdev_ioctl\n ubi_attach_mtd_dev\n  uif_init\n                           ubi_cdev_ioctl\n                            ubi_create_volume\n                             cdev_device_add\n  ubi_debugfs_init_dev\n  //error goto out_uif;\n  uif_close\n   kill_volumes\n                                                    ubi_cdev_ioctl\n                                                     ubi_remove_volume\n                                                      cdev_device_del\n                                                       // first free\n    ubi_free_volume\n    // double free\n\nThe cause of this problem is that commit 714fb87e8bc0 make device\n\"available\" before it becomes accessible via sysfs. Therefore, we\nroll back the modification. We will fix the race condition between\nubi device creation and udev by removing ubi_get_device in\nvol_attribute_show and dev_attribute_show.This avoids accessing\nuninitialized ubi_devices[ubi_num].\n\nubi_get_device is used to prevent devices from being deleted during\nsysfs execution. However, now kernfs ensures that devices will not\nbe deleted before all reference counting are released.\nThe key process is shown in the following stack.\n\ndevice_del\n  device_remove_attrs\n    device_remove_groups\n      sysfs_remove_groups\n        sysfs_remove_group\n          remove_files\n            kernfs_remove_by_name\n              kernfs_remove_by_name_ns\n                __kernfs_remove\n                  kernfs_drain"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: fix memory leak in gpiochip_setup_dev()\n\nHere is a backtrace report about memory leak detected in\ngpiochip_setup_dev():\n\nunreferenced object 0xffff88810b406400 (size 512):\n  comm \"python3\", pid 1682, jiffies 4295346908 (age 24.090s)\n  backtrace:\n    kmalloc_trace\n    device_add\t\tdevice_private_init at drivers/base/core.c:3361\n\t\t\t(inlined by) device_add at drivers/base/core.c:3411\n    cdev_device_add\n    gpiolib_cdev_register\n    gpiochip_setup_dev\n    gpiochip_add_data_with_key\n\ngcdev_register() \u0026 gcdev_unregister() would call device_add() \u0026\ndevice_del() (no matter CONFIG_GPIO_CDEV is enabled or not) to\nregister/unregister device.\n\nHowever, if device_add() succeeds, some resource (like\nstruct device_private allocated by device_private_init())\nis not released by device_del().\n\nTherefore, after device_add() succeeds by gcdev_register(), it\nneeds to call put_device() to release resource in the error handle\npath.\n\nHere we move forward the register of release function, and let it\nrelease every piece of resource by put_device() instead of kfree().\n\nWhile at it, fix another subtle issue, i.e. when gc-\u003engpio is equal\nto 0, we still call kcalloc() and, in case of further error, kfree()\non the ZERO_PTR pointer, which is not NULL. It\u0027s not a bug per se,\nbut rather waste of the resources and potentially wrong expectation\nabout contents of the gdev-\u003edescs variable."
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